Here are links to a couple of tutorials to help those switching from Window-Eyes to NVDA and one for those switching from Jaws to NVDA.
Switching from Window Eyes to NVDA
Switching From Jaws To NVDA
This next set of tutorials are from an older version of NVDA but the concepts and methods haven’t changed. The author of these tutorials is a great developer of add-ons for NVDA. http://www.josephsl.net/tutorials/