OLL 48
The algorithm, how to recognise it and how to practise it without cheating.
Recommended algorithm
F R U R' U' R U R' U' F'10 moves
How to recognise it
Only the back and left edges are yellow on top. Headlights on the left, and the front-right corner's yellow faces you.
Its inverse is another case
Do the 48 algorithm backwards, F U R U' R' U R U' R' F', and you are solving 51.
That's why CubeDojo never scrambles 48 that way: it builds a random state with the case fixed, so you practise 48 and not 51.
Practise 48 now
Random-state scrambles, a timer and spaced review. Free, on the web and on your phone.