How Do You Learn?

Your ears are the only source that matters.  You either hear it or you don't.  Expecting a single source to provide you the same thing your ears tell you is pretty naive.  To learn what's really going on in HIFI you need to collect as much input as possible and let your ears be your filter. Also realizing that in the future what you hear and listen for may change. All those sources you thought weren't of value, could now be very informative  Unfortunately that's how I learn, thru trial and error.
Or just go to Best Buy they know everything... Just ask them

 I like millercarbon’s post above and would extend it to music.  Did anyone see the recent Tony Bennet segment on 60 Minutes?  He is deep in the throes of Alzheimer’s but start playing music or put him in front of an audience and a different person emerges.  I have seen stroke patients who have been aplastic for years suddenly belt out Christmas Carols when the music comes on.  We learn music in different areas of the brain than other language skills.  Do we therefore learn to hear differences in the reproduction of musical sounds in a similar way?  I have no idea.  This is also different from what the OP intended, but a lot more interesting.

Getting back to the original intent, this hobby is is infiltrated by people with agendas.  I like Robert Harley’s books, probably as reasonable a single source as any, but I am very suspicious of him ever since he went whole hog on MQA.  Forget Trump’s tax returns, I would love to see if RH gets any income Bob Stuart.  I learn a lot from these forums, but when something interests me that I encounter here I try to read up on it elsewhere.    Why does the OP want to restrict himself to a single source?  Would you want a Doctor operating on you who has only read a single journal article?