The First Block is the second step of the Lin Method (after Cubeshape) and it consists of building a 3-piece block in the DL position of the Square-1 (similar to the Roux Method on a 3x3).
I chose not to make a sheet about it, and instead made a video tutorial, to make the step more understandable to everyone and to make the solutions and the fingertricks easier to learn.

You can watch the tutorial directly on YouTube by clicking here.