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Goal: Fix white edges that are in the middle layer, flipped the wrong way, or in the wrong place at the bottom. 4 tasks · ★★★ = fewest moves.
The white-green edge is in the middle layer, white facing right. Which ONE move puts it in the cross?
Your cube, unfolded
Goal
Algorithm
Keyboard: U D L R F B turn a face, with Shift for the prime (U'). Y turns the whole cube. Backspace undoes.
A flipped edge on top (white facing the side): put it at the front, then U' R' F R. An edge in the middle layer: turn its side face to bring it into the bottom or up to the top — and turn back anything you moved out of the cross.
Not every edge is easy. An edge in the middle layer can often go straight down with one turn. A flipped edge needs a four-move fix (U' R' F R) that brings it down with white underneath. Two edges swapped in the bottom: lift one out with a half turn, turn the top, and put it in its own place.
Algorithm: U' R' F R
Chapter 2 — The white cross: Put the four white edges around the white centre at the bottom, each one matching the centre on its side.