"Stuff" can mean almost any physical items or material.
It's similar to the word "things", but "things" are countable and "stuff" is not. So "stuff" is better to use when you're talking about a group of things that are different from each other - different sizes, shapes, etc.
"Stuff" is especially used to refer to things that you buy or own:
There's a good chance that you'll end up buying a lot of stuff while you're there.
Excuse me. Would you mind watching over my stuff for me for just a minute?
But "stuff" can also mean "topics" or "ideas", like in this example:
We have a lot of stuff to talk about.
This phrase appears in these lessons:
- “Maybe if we rearrange some of this stuff...?”
- “I'll go pick up all the stuff we need.”
- “The last thing I want is for you to feel like you can't open up to me about this kind of stuff.”
- “There's a good chance that you'll end up buying a lot of stuff while you're there.”
- “That stuff'll clog your arteries.”
- “You should put some stuff on it to keep it from getting infected, don't you think?”
- “I miss hanging out with people that I can really geek out about this kind of stuff with.”
- “I can't believe you watch this stuff. It's so cheesy!”