Garageband - https://support.apple.com/garageband
Logic Pro - https://www.apple.com/logic-pro/resources/
Ableton - https://www.ableton.com/en/live/learn-live/
Pro Tools - https://www.avid.com/pro-tools/learn-and-support#Resources
Maschine - https://blog.native-instruments.com/watch-how-to-get-started-with-maschine/
Cubase - https://new.steinberg.net/cubase/learn/
FL Studio - https://www.image-line.com/fl-studio-learning/fl-studio-online-manual/html/basics_workflow.htm
Bitwig - https://www.bitwig.com/learn/
Reason - https://help.reasonstudios.com/hc/en-us/articles/360002995473-Reason-Intro-Documentation
Reaper - https://www.reaper.fm/userguide.php
Studio One - https://www.presonus.com/products/Studio-One/getting-started
Ableton - https://www.ableton.com/en/live/learn-live/
Pro Tools - https://www.avid.com/pro-tools/learn-and-support#Resources
Maschine - https://blog.native-instruments.com/watch-how-to-get-started-with-maschine/
Cubase - https://new.steinberg.net/cubase/learn/
FL Studio - https://www.image-line.com/fl-studio-learning/fl-studio-online-manual/html/basics_workflow.htm
Bitwig - https://www.bitwig.com/learn/
Reason - https://help.reasonstudios.com/hc/en-us/articles/360002995473-Reason-Intro-Documentation
Reaper - https://www.reaper.fm/userguide.php
Studio One - https://www.presonus.com/products/Studio-One/getting-started
Other Resources, vast banks of tutorials and classes:
https://www.udemy.com/
https://www.pro-tools-expert.com/
https://www.masterclass.com
https://www.udemy.com/
https://www.pro-tools-expert.com/
https://www.masterclass.com