What do you use to compile information and do you keep track of sources?

It depends on the question. I do not have a list of sources.

Do you trust the information even after forgetting the source and not having the context your wrote it in?

When I say I compile information I mean I have a scratchpad in which I fill in the evidence that is relevant to my current needs. So I'll have the source noted there.

What I'm trying to say is that I rarely go back to the scratchpad of a previous question / problem, but I will approach every question and problem with a new search.

Trying to save information for the sake of it without knowing what future use it is going to have stresses me out, so I find that this fresh scratchpad approach works best for me.

I’ve been doing something similar. If I read a blog post / paper, etc. where I learn a lot on a topic I’m interested in, I will catalogue a pdf of it in Obsidian with a tag and an optional note. This makes it easy to access information locally very quickly and I find I learn a lot more because if I forget something, I open up the resource, read the doc and, come out learning a little more. A kind of convoluted version of spaced-repetition but more passive learning.

Granted, I’m aware this probably won’t scale to many topics but a few years and hundreds of notes later, it’s still working well for me.

I don't even save the sources, I'll just assume I'll always have access to the internet and that I'll be able to find what I need when I'm thinking about it.