I think it’s like anything else - you need to have the “want to” if you really want to learn. For me, it was the Plymouth State site for soundings and creating model maps plus a few others that had information. That isn’t even to mention reading every discussion from GSP. I also learned a lot from guys on the WWBB like Eric Thomas, Chris Justice, Allan Huffman, etc. It also helps that it doesn’t seem like anyone just stumbles into meteorology - it’s a passion so they are more than willing to share their knowledge.
Now, there’s so much information just readily available that I never had in the late 90s/early 00s. It is so much easier to learn that you just have to absolutely refuse to let anything sink in to remain ignorant.