Some music communities are better for this than others. Metal has a million resources and people from all over the world. You can get like blogs, podcasts, archives of bands, relationship charts, theory books. People (outside of Reddit) will give you a bunch of generally good recommendations.

Meanwhile classical is basically locked behind randomly cruising YouTube, looking for old LP records at higher-end music shops, and music education.

Any sort of folk music has basically nothing unless you specifically live in the place that folk music is from.

I like '80s/'90s synthy new age music and that's got basically nothing outside RYM and whatever Vaporwave artists are sampling, or if it's a side project of someone who became a movie or game music composer.