How do you retain useful content?

Hii, recently I have been procrastinating a lot while trying to educate myself about personal finance and other personal growth related content.

After a bit of introspection I came to a few conclusions on why I am procrastinating.

The number one reason that came to my mind is that i tend to forget whatever "non-entertainment" stuff I watch on YouTube so what's the point of watching it so I avoid it.

I have tried pen paper notes but i rarely open them again.

I want to know how you remember all those useful articles, videos , podcasts, Twitter posts, grapevine answers that you come across online ?

I have seen people listening to podcasts while travelling to work, if you are one of them then how do you retain the information?