I have a few principles that I try to stick with at all cost.  Part is because I think these are important in themselves, but also I believe that sticking with these basic principles  protects me from all pit-falls and unforeseen traps that life is full of. (1) Speaking the truth at all cost. (2) Not to touch that which does not belong to me. Not just not to steal, but not to have in my possession anything which does not belong tome according to "din Torah" the law of the Torah.  (3) To learn Mathematics, Physics and the Avi Ezri of Rav Shach, The reason for his last one i that is somehow how things have worked out for me. If I would have a Gemara Bava Metzia or Bava Batra, then I would be doing that. Whatever comes under the category of authentic Torah is the main thing. The emphasis is on the word "authentic".