I like Hinge's blog: http://hingeirl.com/. It has some solid tips. Besides that, I haven't found anything else too useful and mostly learned by putting myself out there and making a ton of mistakes. That's not to say there might be some other useful material out there.

I'd be weary of taking advice from reddit or similar communities. Most people who frequent those forums and give advice tend to be plagued with relationship problems themselves.

Of course, dating in a Covid-19 world might be tricky, and it's not something I feel is worth the effort, though YMMV. (fwiw, I used to think the same about online dating, and I was completely wrong.)