Go (Golang) Course

Welcome to the Go Programming course on TechLearningPRO — a structured path from your first Hello, world to production-ready HTTP APIs, PostgreSQL integrations, Docker deploymen…

Before writing production Go, you need a reliable toolchain: the Go SDK, an editor with gopls (Go language server), and environment variables configured correctly.

Every Go journey starts with a small program that compiles, runs, and prints output.

Go's type system is statically typed with type inference via the short declaration operator :=.

Constants in Go are compile-time values declared with const.

Go's fmt package handles formatted I/O; bufio adds buffered reading for performance; os provides stdin, stdout, and stderr file descriptors.

Go's control flow is explicit and readable.

Go has one looping construct: for.

Functions are first-class in Go — they can be assigned to variables, passed as arguments, and returned from other functions.

Go's signature feature is returning multiple values — typically (result, error).

Go treats errors as values implementing the error interface: Error() string.

An array in Go is a fixed-size sequence of elements of the same type.

Slices are Go's workhorse collection — dynamic views into underlying arrays with length and capacity.

Maps are Go's hash table — unordered key-value collections.

Structs group named fields into a single type — Go's primary data composition mechanism.

Methods are functions with a receiver — a special parameter before the function name that binds the function to a type.

Interfaces define behavior contracts — a set of method signatures.

Pointers hold memory addresses of values.

Packages are Go's unit of compilation and namespacing.

Go modules are the official dependency management system introduced in Go 1.11 and default in 1.16+.

A goroutine is a lightweight thread managed by the Go runtime — start one with the go keyword.

Channels are typed conduits for sending and receiving values between goroutines — "Don't communicate by sharing memory; share memory by communicating." Unbuffered channels synch…

Buffered channels have a capacity — sends succeed without blocking until the buffer fills.

The select statement waits on multiple channel operations simultaneously — like switch for channels.

sync.WaitGroup waits for a collection of goroutines to finish.

sync.Mutex provides mutual exclusion — only one goroutine holds the lock at a time.

The context package carries deadlines, cancellation signals, and request-scoped values across API boundaries and goroutines.

Go's os and io packages handle file operations with explicit error checking.

The encoding/json package marshals Go structs to JSON and unmarshals JSON into typed values.

Go's net/http client is production-grade — no third-party library required for most API integrations.

Go's net/http server powers millions of production APIs.

Building a REST API in Go combines net/http routing, JSON encoding, validation, and layered architecture (handler → service → repository).

The database/sql package provides a generic SQL interface with connection pooling.

CRUD (Create, Read, Update, Delete) is the backbone of every backend API.

Go's testing package is built-in — no JUnit equivalent needed.

Benchmarks measure performance with func BenchmarkXxx(b *testing.B).

Go 1.21 introduced log/slog — structured logging in the standard library.

Go has no built-in DI framework like .NET — dependency injection is explicit constructor injection.

Production Go services load configuration from environment variables, .env files (development only), YAML/JSON files, and secret managers (AWS Secrets Manager, Vault).

Go's static binaries shine in Docker — build a minimal image with scratch or distroless base, often under 20MB.

Microservices in Go decompose systems into independently deployable services communicating via HTTP/gRPC and async messaging (Kafka, NATS, RabbitMQ).

Go is fast by default, but production services need deliberate optimization: pprof profiling, reducing allocations, connection pooling, and caching.

Go backend security spans input validation, SQL injection prevention, authentication (JWT, OAuth2), HTTPS/TLS, secrets management, and dependency scanning.

Deploying Go services means building static binaries, containerizing, and running on Kubernetes, AWS ECS, Google Cloud Run, or VM systemd services.

Congratulations — you've completed 45 lessons covering Go fundamentals through production deployment. Includes interactive Go interview question bank.