Step by step until you either succeed or worse
Google Scholar is also an excellent place to start.
Also implemented in https://internet4000.github.io/find/ `!sci <query>` (free software)
So, “steal it” is your method?
Last I used bittorrent seriously was years ago, but back then there were bittorrent trackers that had images of textbooks and the like. They wanted you to establish a relationship with them and either pay or upload popular things. Does anyone here know if that's still happening?
I'd also add arxiv.org, for anything related to the physical sciences.