I started keeping personal one page notes on Github for languages I want to learn so that it's easier to be effective when I start a small project. Here are my Go notes:

https://github.com/melling/ComputerLanguages/blob/master/go....

My OCaml notes are a better example of what I'm trying to do:

https://github.com/melling/ComputerLanguages/blob/master/oca...

If you want quick introduction about some languages, there is also https://learnxinyminutes.com/.