In this section below you will find an intermediate tutorial for the columns method. Compared to the beginner's version this is way more efficient,
with average of 45~50 moves (STM) per solve. This method has plenty of variations, below is my favourite one.
Pretty easy step. More efficient than Roux blockbuilding.
Using one of 42 algorithms solve LL corners.
EO can be done using M' U' M triggers, whereas the centers can be fixed using M M' and S S' moves.
Solve two opposite cross edges: the one to the left and the one to the right.
Solve the rest of the cube using Roux magic.
And now you might just check the "advanced" version of the method in Variations.