Ask HN: How do you use the knowledge gained in a day?

I figured 99.99% of the knowledge I gained from Internet is useless so I didn't bother to take notes at all. If it's really useful then I better start using it in real life. All those books, bookmarks, useless. I'll never do whatever I really love to do professionally and work is mostly a chore. Whatever.

It's all minor stuff. I don't bother storing things that I can web search. I store things that are relevant to my life, or would at least be a pain to find online. For example, I have the door code to my mom's house written down. I visit like twice a year and if I didn't have it written down, I'd lock myself out every time (ask me how I know...).

Other things include planning and documenting projects like travel planning. If I write it down now and have it in one place, I'll look at it at the planned time I'll use it (during the trip).

Another example is info I had to watch a YouTube video for that can be paraphrased. Cleaning and descaling my espresso machine is a good example. It's a few textual lines and I know I do it once every few months, so having it essentially cached in my notes comes in handy.

If I can't Google it (at least in a reasonable amount of time) and I suspect it may come up again, I'll jot it down. If I can't see any way I'd care about it in the future, I don't bother jotting it down.