First question: Do you want to know everything a real pilot knows, or are you satisfied with a fraction of total knowledge? And do you know already what is your favorite slice?
I like sailplane aerobatics. This is a very special slice. I do not care about Garmin G1000 UI simulation or IFR flight or ATC radio. Because FS2020 is not my full time job.
I might recommend these MSFS2020 video tutorials by Squirrel. Gentle and clear introductions to various aspects of flight. I hope he continues and does a comprehensive series.
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+1 for Squirrel’s videos! I did the first few in-game training missions and was still a bit confused. After watching Squirrel’s fourth tutorial video in the playlist linked above I had that “AHA!” moment where everything just clicked for me. Highly recommend!
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another +1 for Squirrel 
This website (navfltsm.addr.com) has been hugely helpful. Exactly what I needed. Learned so much reading through it. Thanks for the suggestion.
Also a recent fan of Squirrel on YouTube, enjoying his videos as well.