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The personal filter works everytime I go to a library. This is how I work:
Step 1: Beginning the year, I come with four types of lectures I want to pursue:
  • something I already know (say bitcoin or politics),
  • something I know I don't know (say bitcoin programming or financial politics),
  • something I don't know at all (physics, soft skills, etc)
  • something for fun (last year I started to read sci-fi)
Step 2: The book I'll choose must fall into those categories and most important is to look my bookshelf and see if I'm currently reading something of that matter. For instance, say I found Bitcoin Standard by Saif but I'm currently reading Knut's books; my goal is to first finish what I started and then proceed to buy the next one. otherwise, I'll turn into a book buyer without any meaning.
Step 3: Is it worth? I mean, do you really need the book now? Can you wait more to buy it?
In that way, I pursue myself to not only buy book but also finish it.