An image is worth a thousand words; a video is worth a thousand images. From the very basics of PixInsight's graphical user interface, to in-depth descriptions of processing tools and techniques, watching PixInsight's video tutorials is the best way to learn and get the most out of PixInsight.
Official PixInsight Video Tutorials
NGC 1808 LRGB Processing Example
Tutorial by Vicent Peris (OAUV/PTeam)
Original raw data by Jack Harvey and Steven Mazlin (SSRO/PROMPT/CTIO).
Other Sites Providing PixInsight Video Tutorials