Ask HN: How do you keep track of all the content you encounter?

I spend a lot of my time looking at HN, reddit, and a lot of other aggregation sites to find new cool projects or ideas. I have hundreds of browser bookmarks, my pocket saves are unwieldy, and a ton of different github stars.

How do people keep track of everything they're encountering? Like sometimes I'll see something and it will remind me of a post or project I saw months ago, but it's almost up to chance if I'm able to find it again or link the two concepts together.