Find if any face is already solved except top layer. Hold solved face at back.
THE SIMPLEST WAY TO SOLVE THE RUBIK'S CUBE A Beginner's Method – Layer by Layer guide to solve rubik 39-s cube pdf
(top-left corner): F U R U' R' F'
Do either case, then repeat.
Look at top face – you have one of 3 cases: Find if any face is already solved except top layer
(horizontal): F R U R' U' F'