That's only relevant to know if you're actually implementing the piece that takes raw input and builds a query out of it, and most devs don't work with that piece on a day-to-day basis.

Knowing that you need to use a framework that takes care of input sanitizing is enough for the typical dev.

Edit: Expecting "prepared statements" as "the" answer seems close to making it a trivia question rather than "sufficient understand for doing the job" question.