Golang is a new language invented by google. It is fast. It is predominantly used for building APIs for heavy workload / data driven tasks so building a whole website in golang (including html templates is probably not a good idea). It is commonly used for building microservices as current.
Installation instructions can be found here: https://golang.org/doc/install
It is a heavily typed language but the learning curve isn't very steep. Golang is well-known and well utilised for its concurrent ability (seen in go routines). See this article for a good visualisation on go routines: http://divan.github.io/posts/go_concurrency_visualize/
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