So, on the Wikipedia page on the derivation of the Schwärzschild solution , I get everything up to the part about the Ricci tensor.

What were the components of the tensor that were used?
Could someone please just show me a step-by-step mathematical description of the solution of the tensor?
If the photo isn't clear enough, here's the link to the page. https://en.m.wikipedia.org/wiki/Deriving_the_Schwarzschild_solution#Using_the_field_equations_to_find_A.28r.29_and_B.28r.29 😄