Ask HN: How to remember technical topics which you don’t use/refer everyday?

There are a ton of topics I learn/read on a daily basis. Some are out of my personal interest, some out of need (when interviewing).

I notice that after a while, without enough usage, these topics simply evaporate from my memory. I know the simple answer is to keep practicing.

I’m interested in knowing how different people do this. Looking for any tips, hacks, etc.