I need to go to prop school somewhere to learn the do's and dont's of prop modification ,(changing) What pitch does and what diameter does ,Weight ,rpm etc. Is there a prop chart somewhere? thanks
First of all there a lots of fellow boaters here that can help with prop selection.
Some reading may help you understand props better but may confuse sometimes.
If you go to the prop store page just below the trolling motor props you will see tabs for prop basics ,prop characteristics, etc.
These should help.
Then if you read the stickys at the top of the prop forum and pose your question to us you may be amazed at the help available.