https://cinelerra-gg.org/download/CinelerraGG_Manual.pdf
http://g-raffa.eu/Cinelerra/HOWTO/basics.html
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+October 2020 New Features of note:
+ Drag select and deselect edits was added on the timeline.
+ Gang mode for patchbay options is now available.
+ Proxy scale factor of 1:1 to change bitrate works.
+ Tile mixers allows for designating a rectangular area.
September 2020 New Features of note:
Motion plugin improvements by SGE for better results.
Camera and Projector menus now include easy range change.