How to cut lumber...

 ...or rather, How I cut lumber. Everybody has there own way this is mine.

First measure your board.

Push the measuring tape so one side is flat on the board as above. 

Make a mark on the measurement line you need 

Make a second mark in a slightly different direction using the same
measurement as before and you will get the above. 

This mark now come to a point which should tell you where you need to cut.
Place you pencil on that point.

Slide your square up to you pencil making sure you don't knock the
 pencil from its place and trace the line.

Look at our beautiful square line.

Now mark the wood to be cut away because the saw takes away 1/8" or more of material.
 I use an X.

I write the measurements on the piece that will be cut out so they
 are easier to sort out later.

When you're cuting you always want to line up the edge of the teeth with your line and not the face of your blade. For every saw I have ever seen the teeth cut wider than the thickness of the body of the blade.

Boom! Look at that, right on the nose!