Golang

What is a goroutine and how does it differ from a thread of the operating system?

What is the difference between buffered and unbuffered channels? What happens when writing to a closed channel?

What is sync.Map and when should it be used instead of a regular map with Mutex?

How does concurrency differ from parallelism?

Tell us about your experience working at [company].ru: what was the state of the project when you arrived?

What is defer and what is it used for? In what order are defer calls executed if there are several in one function?

What is the composition of your current team in terms of size and roles?

What types of JOIN do you know? What records will be in the result of each JOIN for two tables?