Go to the library. (Yes, the place with all the books. ;-) ) Wander through the nonfiction section and scan the titles. If anything catches your eye, pick it up and read the first couple pages. If it seems at all interesting, check it out and read it. This technique is responsible for my reading in depth about the history of shipping containers, learning just a little bit about how to do interior design, and reading…
Consider that Le Corbusier is one of the most famous architects of the 20th century so this was a surprise. Eventually, I did find what I was looking for by going to the library and visiting an architecture exhibition. The point of all this is that we assume everything is mostly online and so it's our first port of call for any research or knowledge gathering. But there is a huge amount of information and knowledge found in books that have never made it online. If you never go to the library, you simply won't realise what you're missing.