What kind of conversations do you consider as small talk?

Question from an INFJ talking to an ISTP. I’ve learned recently that ISTPs hate small talks. Can anyone tell me more specifically what kind of conversations qualify as small talk?

When I’m talking to my ISTP friend, i try not to bombard her with: - what are you doing? - have you eaten? - how was work?

I mean, i do ask these questions but i would usually have asked something else first. Something about her interests and stuff. But i can’t help but think that i may still be having small talks with her without realizing. I don’t want to bore her. Please help a fella out! Thanks!