To answer “just one source”, I would say Stereophile magazine. Years ago they had a reviewer that shared my taste in music and preference for gear. I found that helpful in future upgrades, although most of my gear was never on Stereophile’s Recommended Components List. When he reviewed equipment with music I had, I could compare what I heard with his comments. I became better at listening and understanding the lingo.
Although a reviewer may give a glowing report, the equipment may not give the same results to someone with different system components, room, music preference and ears. But it can still be helpful and educational.
I know the magazine has its detractors but I consider it one of the better resources for reviews, information and audio news.
I’m a long time subscriber. I’ve subscribed to most of the other audio mags over the years (many defunct), this is one of the last ones standing and one of the best.