Question: How do you cut wood?
Options:
Obtain a saw horse and put it somewhere you can work.  Place the board(s) across it and push the saw back down against the wood.
Obtain a saw horse and put it somewhere you can work.  Place the board(s) across it and slide a saw back and forth against the wood.
Answer: Obtain a saw horse and put it somewhere you can work.  Place the board(s) across it and slide a saw back and forth against the wood.