"I'm bad at sth" or "I'm bad in sth"?

English as a Second Language English Vocabulary, Grammar and Idioms
1

Which is correct?
Please take an example.

2

I’m bad at something
or
I’m bad at doing something.

3

Hi Dodgewiper

“you are bad at something.” in the same way can say " you are good at something."
" you are bad at doing something." ~ " you are good at doing something."

You are good at playing basketball.
You are bad at playing basketball.
You are good at math.
You are bad at math.

4

Thanks.

5

Can I say “I’m poor at something” / “I’m poor at doing something” in the same sense?

6

Yes.

7

Thank you, B.

Here’s an apple pie for you. Oh, I already had a slice of it.

8

What’s the name of the food which you are eating, Tofu?