F2L 1
The algorithm, how to recognise it and how to practise it without cheating.
Recommended algorithm
U R U' R'4 moves · R and U only
Alternatives
U2 R U2 R'4 moves · R and U onlyR' F R F'4 moves
How to recognise it
Corner above the slot with white facing you; the edge is beside it on the right, already paired with it.
Its inverse is another case
Do the 1 algorithm backwards, R U R' U', and you are solving 4.
That's why CubeDojo never scrambles 1 that way: it builds a random state with the case fixed, so you practise 1 and not 4.
Practise 1 now
Random-state scrambles, a timer and spaced review. Free, on the web and on your phone.