The combination square is a fundamental tool for almost all woodworking jobs, but most people don’t know how to properly use it. Get back to basics and learn how a combination square will take your craft to the next level. - My Saws And Jigs
This woodworking tricks cheat sheet is If no one reads my wall, this should be a short experiment . If you read This, leave one word on how we met. Only one word. Then copy this on your wall , so I can leave a word for you.
I found a useful hardness chart for various types of wood with colors associated for each type