Learning Go Programming Training Course

1. Introduction to Go

• Overview of Go (Golang).
• Historical context and design philosophy.
• Go as a language for web and systems programming.
• Key characteristics:
  • Static typing.
  • Emphasis on simplicity and readability.
  • Fast compilation times.
  • Native concurrency support.
  • Automatic garbage collection.
  • Cross-platform compilation capabilities.
• Common use cases for Go.
• Advantages and limitations of the language.
• Comparison with C/C++, JavaScript, Ruby, Python, and Java.
• Understanding the Go ecosystem.
• Overview of the Go standard library.
• Go modules and dependency management.
• Anatomy of a Go application.
• Hands-on: Examine and execute a simple Go program.

2. Setting Up the Go Development Environment

• Installing Go.
• Understanding the Go toolchain.
• Configuring environment variables.
• Selecting an IDE or code editor.
• Utilizing the command line with Go.
• Creating a Go workspace.
• Understanding Go project structure.
• Initializing projects with Go Modules.
• Using go mod init.
• Managing dependencies with go get.
• Updating and inspecting dependencies.
• Formatting source code with gofmt.
• Running programs with go run.
• Building applications with go build.
• Installing Go applications.
• Cross-compiling applications.
• Hands-on: Create and configure a Go project within a container.

3. Go Variables, Constants, and Types

• Variable declaration.
• Explicit versus inferred types.
• Short variable declarations.
• Constants.
• Zero values.
• Variable scope and lifetime.
• Primitive data types:
  • Integers.
  • Floating-point numbers.
  • Complex numbers.
  • Booleans.
  • Strings.
• Type conversions.
• Working with Unicode and UTF-8.
• Runes and bytes.
• Multiple variable assignment.
• Understanding type safety.
• Exercise: Develop a small command-line data-processing program.

4. Operators and Expressions

• Arithmetic operators.
• Comparison operators.
• Logical operators.
• Assignment operators.
• Increment and decrement operators.
• Operator precedence.
• Integer and floating-point calculations.
• Avoiding common type-conversion errors.
• Exercise: Implement calculation and validation logic.

5. Dates, Times, and Formatting

• Using the time package.
• Creating and manipulating dates.
• Retrieving the current time.
• Time zones and locations.
• Parsing dates and times.
• Formatting dates and times.
• Calculating durations.
• Working with Unix timestamps.
• Handling timeouts.
• Exercise: Add timestamps and duration calculations to an application.

6. Arrays, Slices, Maps, and Structs

Arrays

• Declaring arrays.
• Initializing arrays.
• Iterating over arrays.
• Multi-dimensional arrays.

Slices

• Understanding slices versus arrays.
• Creating slices.
• Appending elements.
• Copying slices.
• Slice length and capacity.
• Slicing slices.
• Common slice pitfalls.

Maps

• Creating maps.
• Adding and removing entries.
• Checking for key existence.
• Iterating over maps.
• Maps containing complex data.

Structs

• Defining structures.

• Struct fields.

• Initializing structs.

• Nested structs.

• Anonymous structs.

• Struct methods.

• JSON struct tags.

• Hands-on: Model users, products, and application data using structs, slices, and maps.

7. Conditional Logic and Loops

• if statements.
• else and else if.
• Variable declarations within conditions.
• for loops.
• Infinite loops.
• Loop conditions.
• break and continue.
• Iterating with range.
• Nested loops.
• switch statements.
• Expression-based switches.
• Multiple cases.
• Default cases.
• Type switches.
• Exercise: Implement application validation and processing logic.

8. Functions

• Defining functions.
• Function parameters.
• Return values.
• Multiple return values.
• Named return values.
• Variadic functions.
• Anonymous functions.
• Function values.
• Closures.
• Recursion.
• Passing functions as arguments.
• Error-returning functions.
• Designing small, reusable functions.
• Exercise: Refactor existing code into reusable functions.

9. Pointers and Memory Concepts

• What is a pointer?
• Address-of and dereference operators.
• Pointers and function parameters.
• Pointer receivers.
• Pointers to structs.
• Nil pointers.
• When to use pointers.
• Value versus reference semantics.
• Understanding Go's memory management and garbage collection.
• Common pointer mistakes.
• Hands-on: Modify application data using pointers.

10. Creating a Web Application in Go

• Overview of Go's web capabilities.
• Introduction to the net/http package.
• Creating an HTTP server.
• HTTP requests and responses.
• HTTP methods.
• Request URLs and query parameters.
• HTTP headers.
• HTTP status codes.
• Routing fundamentals.
• Creating handlers.
• Handling form data.
• Serving static files.
• Working with HTML templates.
• Template variables and control structures.
• Structuring a web application.
• Hands-on: Build a basic Go web server.

11. Building a RESTful Web Service

• REST architecture fundamentals.
• Designing API endpoints.
• GET, POST, PUT, PATCH, and DELETE methods.
• Working with JSON.
• Encoding and decoding JSON.
• Request validation.
• HTTP status codes.
• Error responses.
• Query parameters and path parameters.
• API response structures.
• Separating handlers from business logic.
• Hands-on: Build a CRUD REST API.

12. Go Runtime, Compilation, and Project Builds

• Understanding the Go compiler.
• Go's build process.
• go run.
• go build.
• go install.
• go test.
• Build flags.
• Environment-specific configuration.
• Building for different operating systems and architectures.
• Producing standalone binaries.
• Managing application configuration.
• Exercise: Compile the application for multiple platforms.

13. Working with Files and the Web

• Opening and closing files.
• Reading files.
• Writing files.
• Creating directories.
• File metadata.
• Buffered I/O.
• Working with streams.
• Reading and writing JSON files.
• HTTP clients.
• Making outbound HTTP requests.
• Handling HTTP client errors.
• Timeouts and cancellation.
• Processing API responses.
• Hands-on: Retrieve data from an external API and persist it locally.

14. Error Handling and Debugging

• Go's approach to errors.
• Returning errors from functions.
• Checking errors.
• Creating custom errors.
• Wrapping errors.
• Adding context to errors.
• errors.Is and errors.As.
• Panic and recovery.
• When to use panic.
• Debugging common Go problems.
• Logging application activity.
• Using Go debugging tools.
• Exercise: Diagnose and fix deliberately introduced application errors.

15. Interfaces and Abstraction

• What is an interface?
• Implicit interface implementation.
• Defining interfaces.
• Interface values.
• Empty interfaces / any.
• Type assertions.
• Type switches.
• Pointer versus value implementations.
• Designing small interfaces.
• Dependency inversion.
• Using interfaces for testing.
• Reducing application coupling.
• Hands-on: Introduce interfaces into the sample web application.

16. Packages and Project Organization

• Creating packages.
• Package naming conventions.
• Exported and unexported identifiers.
• Importing packages.
• Package initialization.
• Organizing application layers.
• Internal packages.
• Managing dependencies with Go Modules.
• Semantic versioning.
• Using third-party packages.
• Avoiding circular dependencies.
• Designing maintainable Go projects.
• Exercise: Refactor the application into separate packages.

17. Concurrency with Goroutines

• What is concurrency?
• Goroutines.
• Starting goroutines.
• Understanding lightweight concurrent execution.
• Synchronization challenges.
• Shared state.
• Race conditions.
• Using sync.WaitGroup.
• Mutexes and read/write mutexes.
• Atomic operations.
• Hands-on: Convert a sequential task into concurrent processing.

18. Channels

• Understanding channels.
• Sending and receiving values.
• Buffered versus unbuffered channels.
• Blocking behavior.
• Closing channels.
• Ranging over channels.
• Directional channels.
• Channel-based communication.
• Select statements.
• Timeouts and cancellation.
• Worker-pool patterns.
• Producer/consumer patterns.
• Hands-on: Build a concurrent worker system.

19. Context and Request Management

• Why contexts are important in web applications.
• context.Context.
• Request-scoped context.
• Cancellation.
• Deadlines.
• Timeouts.
• Propagating context through application layers.
• Cancelling database or HTTP operations.
• Avoiding context misuse.
• Exercise: Add request cancellation and timeouts to the web application.

20. Testing Go Applications

• Why automated testing matters.
• Writing unit tests.
• The testing package.
• Test functions.
• Test naming conventions.
• Table-driven tests.
• Testing errors.
• Testing HTTP handlers.
• HTTP test servers.
• Test fixtures.
• Test coverage.
• Benchmarks.
• Example tests.
• Testing interfaces with mocks or fakes.
• Hands-on: Create a test suite for the sample application.

21. Performance Optimization

• Understanding Go application performance.
• Identifying bottlenecks.
• CPU versus memory performance.
• Efficient data structures.
• Reducing unnecessary allocations.
• Strings, bytes, and buffers.
• Goroutine management.
• Avoiding excessive concurrency.
• Caching strategies.
• Database and network considerations.
• Profiling applications.
• Benchmarks and performance testing.
• Using Go's profiling tools.
• Exercise: Profile and optimize a deliberately inefficient application.

22. Security and Robust Web Application Practices

• Validating user input.
• Safe handling of HTTP requests.
• Preventing common web vulnerabilities.
• Secure error handling.
• Authentication and authorization concepts.
• Managing secrets and configuration.
• Secure HTTP communication.
• Avoiding sensitive information in logs.
• Dependency management and updates.
• Resource limits and request timeouts.
• Exercise: Review and harden the sample API.

23. Application Logging and Observability

• Logging fundamentals.
• Structured logging.
• Log levels.
• Request logging.
• Error logging.
• Correlation and request IDs.
• Monitoring application behavior.
• Basic metrics.
• Health-check endpoints.
• Diagnosing production problems.
• Hands-on: Add structured logging and health checks.

24. Containerizing the Go Application

• Why use containers?
• Go applications and containerization.
• Writing a Dockerfile.
• Multi-stage builds.
• Building a minimal runtime image.
• Managing configuration through environment variables.
• Container networking.
• Exposing application ports.
• Running the application in a container.
• Testing the containerized application.
• Hands-on: Package the sample Go application as a production-ready container.

25. Deployment

• Preparing an application for production.
• Building production binaries.
• Environment configuration.
• Container-based deployment.
• Deployment architecture.
• Reverse proxies.
• HTTPS/TLS considerations.
• Application health checks.
• Graceful shutdown.
• Handling operating-system signals.
• Scaling Go web applications.
• Horizontal versus vertical scaling.
• Basic deployment troubleshooting.
• Hands-on: Deploy the sample web application.

26. Capstone: Complete Go Web Application

Participants integrate the concepts learned by developing a complete application.

The project may include:

• Project initialization with Go Modules.
• Package organization.
• HTTP routing.
• REST API endpoints.
• JSON request and response handling.
• Input validation.
• Error handling.
• Interfaces.
• Concurrent processing.
• External API communication.
• File or database persistence.
• Automated tests.
• Logging.
• Performance considerations.
• Containerization.
• Production configuration.
• Deployment.

27. Review and Best Practices

• Review of core Go syntax.
• Go coding conventions.
• Writing idiomatic Go.
• Keeping code simple.
• Effective package design.
• Error-handling best practices.
• Interface design principles.
• Concurrency best practices.
• Testing strategies.
• Performance considerations.
• Maintainability and readability.
• Common mistakes made by new Go developers.
• Recommended approaches for continuing Go development.

28. Conclusion

• Review of key concepts.
• Review of the completed web application.
• Questions and discussion.
• Troubleshooting common real-world scenarios.
• Recommended next steps for Go development.
• Additional Go libraries and ecosystem resources.
• Further opportunities for building production-grade Go services.