I answer questions for free.
I used a framing square for every day for years and frankly I never knew all the lines either.
At fixya they say 'real' experts don't provide a link but instead explain every detail to answer the question.
However in this case, the best detail is the following:
Do a google search for 'how to use a framing square
After reading about the framing square, if you have a specific question how to use it, then add a comment and I will help fill out the details. For example if the terminology is confusing. Here's my favorite framing square tip
Put the square on the edge of a piece of plywood.
Hold the pencil at a mark.
Then slide the square along the plywood while holding the pencil, and it makes a long straight line. It takes some practice.Here's another tip
Sometimes when you cut a piece of wood, the power saw blade tears up the wood.
This is true with your hardwood cuts.
So let's say I am going to cut a 1x6 oak across the grain.
Oak is brittle and it chips with a crosscut, especially with a dull blade.
Use the square to draw a line across where you want your cut.
Bring the square back just a little from the mark ... maybe 1/32 inch ... then score the wood with a sharp utility knife.
Let the blade run along the square for a nice straight line.
Now when you cut your board, and the oak chips out, the little chips stop at the score line.