F2L 3
The algorithm, how to recognise it and how to practise it without cheating.
Recommended algorithm
F' U' F3 moves
How to recognise it
Corner above the slot with white facing you; the edge is on the left, its top colour matching the corner's right sticker.
Its inverse is another case
Do the 3 algorithm backwards, F' U F, and you are solving 2.
That's why CubeDojo never scrambles 3 that way: it builds a random state with the case fixed, so you practise 3 and not 2.
Practise 3 now
Random-state scrambles, a timer and spaced review. Free, on the web and on your phone.