Related is Richard Feynman's method, quoting https://findings.com/joejanowski/document/18782:
Richard Feynman was fond of giving the following advice on how to be a genius. You have to keep a dozen of your favorite problems constantly present in your mind, although by and large they will lay in a dormant state. Every time you hear or read a new trick or a new result, test it against each of your twelve problems to see whether it helps. Every once in a while there will be a hit, and people will say: "How did he do it? He must be a genius!"
Reading digital copies has a major advantage in that you can search by keyword and only read the stuff that is pertinent to your research/goal. The rest is useless and you don't even have to skim through it...