If it helps you to visualize, one somewhat common/popular form of personal knowledgment management is a wiki. Like Wikipedia, except it’s personal (or for a small team). You can keep track of references and also make notes about things, but it’s also about connecting ideas together. Just like on Wikipedia, you can have a page about, let’s say LLMs, which includes all the software and approaches you’ve tried, results, sample snippets, references to repos, but as you’re writing about what you’ve tried and what worked, you might also have links to other wiki pages, like programming languages, build tools, test tools, etc. As you document more and build more knowledge, your articles all get meshed together in one well-organized network. Ideally it should be easy to navigate if you come back to a technology later and need to get back up to speed.

Tiago Forte’s book Building a Second Brain has some good arguments for using a personal knowledge management system.

Some day those sites won’t be there any more - and the Wayback Machine doesn’t store everything. Plus what if you just want to save a great quote from something you read?