Here’s a great site to learn to crochet.
This first link takes you to the intro video https://www.woolandthegang.com/videos/introduction
and here are images for getting started
and go here to learn how to make a flat circle
This takes you to all their videos. Once there scroll down to the bottom to see all the crochet videos https://www.woolandthegang.com/videos
One of my other favorite sites for free patterns and all around good style is Purl Soho. Find them here: http://www.purlsoho.com/ Below is the pattern for making these crochet balls… try it out as a way to start making three-d fiber sculpture.