It's the same as reading books. You won't remember everything, but you'll definitely remember parts of it.
If you read more books on the same topic, you still won't remember everything from each individual book, but you'll remember parts of each.
Those bits add up quick, and you'll eventually find that you now know more than you knew before.
If you're in a conversation on something related to what you know you've read before, or you're writing about something related, but you vaguely remember the details you wish to speak about, you can revisit that book and skim it until you find what you were looking for. Now, that part you just found would stick with you for much longer.
All I wrote is about reading books, but it also applies to podcasts.
I too love listening to podcasts and reading books.
I've had threads asking people for their favorite podcasts -
The revisiting point is the key insight here. The problem is most people have no structured way to go back. Notes help but only if they're searchable and actually live somewhere you'll return to.
If you read more books on the same topic, you still won't remember everything from each individual book, but you'll remember parts of each.
Those bits add up quick, and you'll eventually find that you now know more than you knew before.
If you're in a conversation on something related to what you know you've read before, or you're writing about something related, but you vaguely remember the details you wish to speak about, you can revisit that book and skim it until you find what you were looking for. Now, that part you just found would stick with you for much longer.
All I wrote is about reading books, but it also applies to podcasts.
I too love listening to podcasts and reading books.
I've had threads asking people for their favorite podcasts -
https://news.ycombinator.com/item?id=43220656
https://news.ycombinator.com/item?id=44308854