Welcome to the site. There are lots of great places for beginners to read about bonsai, and the Reddit wiki is probably one of the better ones. I’d recommend that you read the stuff here, especially the beginner’s walkthrough:
https://www.reddit.com/r/Bonsai/wiki/index
If you have more questions after reading that, and you probably will, feel free to ask.
I’ll give one pro tip: First, focus on keeping your trees alive and healthy. Then after you have that down, then you can focus on “bonsai techniques” like wiring, repotting, chopping, defoliation, etc.
I hope that you find bonsai as enjoyable as we do.