Ok so I was watching an episode of Brooklyn Nine-Nine, where one of the characters made a grammar error on purpose. He said:
"Some things might come easier to you when you stop being such a perfectionist. A concept you should become familiar with."
The other character replies:
"A dangling preposition?!".
Now as a non-native speaker, I don't quite understand what the grammar error here is. For me, "becoming familiar with a concept" makes perfect sense. Why is this an erroneous sentence?
Being a duplicate: It's not a duplicate of that question, as that is about the general idea of dangling prepositions, and this was a specific one that I was not able to understand even when using the proposed duplicate answer. I know, I'm stupid.