Best way to learn how to sail?
I will echo others opinions here.
1. take an adult sailing class.
2. crew on a boat in your local club''s wednesday (or whatever) night races. There is always someone looking for a crew.
You will learn more about sailing while racing (sail handling, trim, etc...) racing than just about any other way.
Once you know how to sail then it is time to learn boat handling ... which is not always a s easy. Power Squadron courses are good as is experience. Start on a small boat and build up also.
Sailing is a lot of fun while learning .. enjoy!