What does 你要买点儿什么？ mean exactly? (吗 question vs. Wh- question) I already learned that Chinese wh- questions don't require a 吗 particle but I got stuck on this sentence: 你要买点儿什么？

Which does the sentence mean, "what will you buy?" or "will you buy something/anything?"

The 点儿 confuses me a bit. That's why I'm not sure if the question 你要买点儿什么？ is asking whether or not to buy or what to buy.

Also if I add a 吗 to the end of the sentence, thus 你要买点儿什么吗？, what will it mean?

Thanks for your help in advance!
Yes, with or without 吗 could be different.

你要买点儿什么？ -> What would you buy?

你要买点儿什么吗？ -> Would you buy anything?

点儿 doesn't change the basic meaning here. It just means a bit/a little, and makes the mood soft.