Concurrency and tools

5 lessons in the Go course.

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• Goroutines IntroStart lightweight concurrent functions with the go keyword.
• Channels IntroSend and receive values between goroutines with channels.
• Go ModulesInitialize a module, manage dependencies, and tidy go.mod.
• Testing BasicsWrite table-driven unit tests with the testing package.
• fmt and ioFormat output and read bytes with fmt and basic io patterns.