TLDR is a great application that provides simplified versions of man pages for many commonly used command line applications. Just about any command that you can think of there is a TLDR for it: git, ack, jq, composer, vim, curl, wget, and many more. Instead of providing a verbose man page, it just has a simple description as to what the command does as well as a few common ways of using the command.

For an example, this is the result of tldr composer: