The layer-by-layer method in 9 stages. Full course with animations and simulator: strefa-kostek.pl/en/kursy
R right, L left, U up, D down, F front, B back - a quarter turn clockwise when you look straight at that face (for L from the left, for D from below, for B from the back). R' = the other way, R2 = half turn, y = rotating the whole cube in your hands like U. The cube is yellow side up the whole time.
Four white edges around the yellow centre, white facing up.
White cross on the bottom, edge sides match the centres.
Turn the top (U) until the side colour of a petal is above the centre of that colour. Then two turns of that face, e.g. F2. Repeat for all four petals, in any order.
The whole bottom layer solved.
Put a corner with white from the top layer above its place (between the centres of its two other colours); hold that place at the front right. Repeat:
R U R' U'
white facing right: 1 time, up: 3 times, front: 5 times.
Corner on the bottom, but wrong? Put it at the front right, do the sequence once - it will come up to the top.
The two bottom layers solved.
Edge from the top without yellow: turn U until its side colour is above the centre of that colour (upside-down T). Hold that face at the front. The colour on top tells you which way:
Edge in the middle, but wrong? At the front right do “to the right” with any edge - it will come up to the top.
Yellow cross on top (the sides do not matter yet).
F R U R' U' F'
The sides of the yellow edges match the centres.
Turn U until at least two match. Put the matching ones at the back and on the right (rotating the whole cube):
R U R' U R U2 R' U
Every yellow corner between the centres of its three colours (twist does not matter).
Hold a corner that is already in place at the front right:
U R U' L' U R' U' L
1 or 2 times. None in place? Do it once from any side.
A solved cube.
Untwisted corner at the front right. Repeat:
R' D' R D
until yellow is on top (2 or 4 times). Turn only the top (U) to the next corner and again. The bottom falls apart along the way - do not stop, do not rotate the whole cube. Finally turn the top.