What are the easiest perennial vegetables, fruit, trees, and bushes to grow?

Hi. So I am beyond a beginner of growing plants, I have always been really interested in plant life and the different conditions they need to thrive. What would be some of the best beginner food growing plants, trees, bushes, or root vegetables to grow? Also I really didn’t understand what the soil and water sample container thing was that other people posted on this subreddit, could someone explain that to me? Thank you.