Read, think, and sleep. Problems in this category often need time in your brain to settle and clarify. The process is rewarding, and after you’ve tackled a few

Read, think, and sleep. Problems in this category often need time in your brain to settle and clarify. The process is rewarding, and after you’ve tackled a few such problems (either proving them impossible or actually solving them) you gain confidence. A subset of unsolved or unsolvable problems might become long term projects that you can manage and prioritize (or eventually put aside) over the years.