People (maybe even you) are running obstacles very often when it comes to worldbuilding. The internet is full of worldbuilding question lists to help it: factions, people, magic, tech and so on.
There are several different question sheets, for different purposes, and be honest: with different quality. Some of these sheets involve questions even about the favorite color of the clothing of the character's pet, or the exact amount of salt in the celebrational dinner of a city in a country.
On Reddit (/r/worldbuilding), I've noticed that people tend to skip certain questions, either absolutely, or for a small amount of time.
I'd like to avoid it and concentrate only on the matter. Can you provide key questions that usually cannot be skipped?
I think of ones like:
character: name, gender, age, race, skin color, hair color, place of born...
factions: name, form of government, age, major cultural traits, current wars, wealth, state religion...
magic: basic means of usage, limits, time to learn, time to master, what prevents from destroying the world with it...
These are very loose examples, to get the idea.
Also, I know this question is possibly too broad, so I'm asking only about the most fundamental things, that are equally important in a D&D game and in a novel - if there's any such question. If there isn't, then only one purpose is enough.