For non-audio, I use EverNote heavily.
For non-audio, I use EverNote heavily.
These days, I use a traditional index card system combined with a spaced-repetition flashcard system. Each concept that I feel like collecting information about has a small stack of cards that starts with a 1- or 2-sentence definition, in case I’m using a term slightly differently from other people. Below that are cards that represent quotes, notes, summaries, and recommended reading on that topic.
The flash card deck is to make sure I know what things exist, and what words are used in the literature to refer to abstract things. If I need more detail than I can remember, those keywords will get me to a relevant wikipedia page, at least.
To take a concrete example, the April 2020 issue of Smithsonian has a feature about a tidal power generation startup. I filed that under “sustainable power generation”, as you might expect. I also filed it under “Island communities” because of only a single sentence I found in the article: The startup’s target market is small- or medium-sized islands that are powered by imported diesel fuel.
What I've personally found is it's way too cumbersome to pull the phone out of your pocket, unlock it, press the "Add Note" button (assuming the Now Playing screen is already showing, otherwise another click for that), type in your notes, and click save...and probably rewind 15 seconds because you lost track of the conversation.
But now that I write this out I realize a Siri shortcut could be apt here.
Happy to get involved if you take the above route