What beans should I buy for practice?

To save money, and improve health?
What beans should I experiment on cooking? I tried before Covid and they didn’t soak properly and I had to toss.

Also what YouTube videos do to recommend on shopping and cooking beans?

Also how many types of beans are found in a typical store or online?

I have a stove, electric frying pan and slow cooker.

I am open to chili recipes.