The American Academy of Dermatology, it's an acne resource center. The National Institute of Arthritis and Musculoskeletal and Skin Diseases and WebMD Acne Center. There are tons of online resources that you can use. I know people who have used them and it's helped a lot.
Something that was really insightful when I was first looking into skincare is a YouTube channel called Beauty Within. It does seem more like a cosmetic beauty channel, however it's mostly about skincare. They have really really insightful videos about how to build a skincare routine, what different products are really good, and what they like best, and it's incredibly reliable. I have used several products that they recommend and loved them every single time. I've never gotten something that I regretted, so if you're looking into skincare, I would definitely recommend that YouTube channel.
If you don't know where to look for skincare products and are kind of concerned about price, I recommend the brand called The Ordinary. They have really good quality products, but it's not as expensive as the things that you normally see. The prices that I've dealt with normally range from about $6 to maybe $12, so they're really affordable and they have lots of products so I definitely recommend them. I also really like Paula's Choice. That brand is a little bit more expensive, however really really really good quality products, so I would 10 out of 10 recommend if you can afford it. Also, Korean skincare is generally very affordable, so looking into different Korean skincare brands can be helpful when you're looking for skincare products because they're affordable and they work really well.