DYOR is the acronym for Do Your Own Research.
Do Your Own Research has become a fundamental term used by the cryptocurrency communities for new entrants into the market. The nascent and experimental nature of cryptocurrency has many abstract principle underlying it and being able to persuade people to join the field has proven to be much more effective through self education.
example:
Bitcoin is hard, sound, provably fair, sovereign money with a constrained supply; and is thus more effective as a universal unit of account than is government fiat currency.