Making HTTP calls with net/http

Defining structs

Serializing JSON

Handling errors

Using defer to manage resources

Working with io.Reader & io.Writer interfaces

Working with slices

Writing methods

Understanding interfaces

The built-in recover function

Named return values

Reading line by line with bufio.Scanner

Using regular expressions

Using goroutines & channels

Using the sync package to coordinate work

Working with multiple channels using select

Using context for timeouts & cancellations

Standard library support for context

Working with the testing package

Using testify

Managing dependencies with go mod

Writing sub-packages

Writing handlers

Using gorilla/mux for routing

Using expvar for metrics

Using the log package and a look at user/zap

Reading environment variables and a look at external packages

Using the flag package for command line processing