What are the best ways to learn the foundational skills of assessing a stock?

I am trying to find a course or good places to build my foundational understanding of assessing a stock. Some online sources are okay but, a lot of them don't start with the fundamentals they explain the P/E ratio then explain the numbers that are used to calculate it but they don't explain those numbers and etc…

​

I am just trying to find the best place I can learn the abc's (not “always be closing”)