This is a very useful video series of key accounting concepts for investors from Aswath Damodaran, a Professor of Finance at NYU’s Stern School of Business. Aswath is one of the clearest teachers of investing and finance and through his blog, books, and YouTube has open-sourced his wisdom.
https://youtube.com/playlist?list=PLUkh9m2BorqmKaLrNBjKtFDhpdFdi8f7C&si=YZoKlahIF0DmNCJB