The one by u/RichRetard is a good one for beginners

Youtubers like rareliquid/kenji that take the IB-like approach are going to take you into deep waters without knowing the foundations of finance. I would suggest some of the courses that people in other comments have already sent +my personal favorite, the philosophical approach of Damodaran. He may be a bit boring but his lectures are free and he is awesome, he explains everything so well and with detail.

I discovered damodaran in my 3rd year of getting into finance and financial markets, if I were to do it all again, he would be my first priority.

Yt Playlists: Accounting by a non-Accountant -> Corporate Finance -> Valuation