How do you remember what you've learned by reading ?

For a long time I've read a lot of content about building and growing businesses, like the content published in Indie Hackers. The thing is most of the time I forgot what I've learnt a couple of weeks later and never apply it.

I'm trying to build something that helps people spend less time reading content that they'll forget before applying it and helps them remember what they've learnt.

I'll try to build it for the Product Hunt Hackaton: https://www.producthunt.com/upcoming/principles

How do you actually make the most of the content you consume?

Do you take notes? Do you apply it instantly? Or you just read it and forget shortly after?