In the world of ideas, all you need is a little bit of intentionality to cultivate ore and keep track of those ideas. You can find more free educational content on line than you could ever consume in a hundred lifetimes. Ideas are this kind of thing that is both free and plentiful, and that you can store forever.
Creativity flows from abundance. Instead of sitting down to a blank canvas and trying to think of something clever, start your creative process by sifting through a plentiful supply of interesting ideas, insights, and inspirations that you can build off of. Your Second Brain is the perfect place to collect this creative raw material.