I'm not sure under what circumstances I should use "I get it" or "I got it".

Native speaker’s answer
Rebecca
Ah! So in regards to confirming if you understood something, "I got it" and "I get it" are used interchangeably! However, it can also depend on context and tone. "I got it" can emphasize that you understood the point already and don't need another explanation. "I get it" works well if you just understood something and there's a moment of realization. "Got it" can also be said by itself, but "get it" needs the subject "I." Ex: Ah, I get it now! Ex: I got it, Dan. You don't need to explain it again. Ex: Okay. Got it. = Okay. I get it.