Investing in the stock market as a teen

its quite rare to activly invest in the stock market as a teen, but i want to. the problem is, i have no clue on where i can start, i have read on numerous pages that all you need to start with is $20. i got a couple hundred. i have no problem losing money as i want to do this for experience. i want to research companies and find places where they have low fees (idk wat type of fees they are (transaction, etc) they usually have a low amount like $3 a trade or something). if someone can point me in the right direction i would appreciate it.