⟩ Can I admit to the interviewer that I don't know something?
Don't be afraid to admit that you don't know something. While you definitely want to seem knowledgeable, don't lie to make it seem like you know something you don't. You probably won't fool your interviewer, and admitting to not knowing something is much more impressive than lying during your interview. If need be, just acknowledge that you do not know the answer but will find out more about it and let them know afterwards.