If you’re on mobile, go to the end of the crochet pattern. Under it will be a rectangle saying Crochet Patterns and another rectangle sating Knit Patterns. Click the rectangle saying Knit Patterns. There you will find eight patterns, one of which is garter. I intend to do all the patterns. I started with garter stitch.
I’m still new enough I can’t make needle recommendations, but my first project was a garter stitch scarf. 10 stitches on size 13 needles… yeah… that wasn’t much of a scarf.
Similar experience to you with learning how to crochet. Right now all I can do is a chain stitch. And nothing else. No adding any height to the chain, just making a single long chain.