[ChemicalWarfare]

"full stack" is definitely an overloaded term but then again I wouldn't consider the kinds of questions OP mentions to be something only the experts would (or should) be able to answer on the basic level.

Things like get vs post, encoding, basic headers (like accept etc) should be familiar to anyone dealing with the client side development regardless of the tools/frameworks.

And then on the backend some basic SQL, basic understanding of indexing, FKs, PKs, maybe simple inner joins is also something that someone doing anything DB-related on the backend should be familiar with (unless we're talking someone who is only familiar with nosql dbs) regardless of the tools/frameworks/orm etc.