I always find this to be handy: https://learnxinyminutes.com/ https://learnxinyminutes.com/ It is useful as a cheat sheet. In addition: if you have experience

I always find this to be handy: https://learnxinyminutes.com/ https://learnxinyminutes.com/ It is useful as a cheat sheet. In addition: if you have experience in multiple "imperative" language (read: non-functional / non-prolog / etc) it's easy to pick up another language using that site alone.