As noted, sales and profit are not required in order to show infringement. So you need to consider that of course. While you are free to ask for...

Is this trademark infringement?

It is very unlikely that this will ever be a problem for you in this context, but as noted you certainly will have trademark issues if you were...

This really depends. As you note, people do this all the time. And in general, you are free to buy an item like a shirt, make modifications to that...

As noted, all the facts and circumstances surrounding this need to be understood. Was there any agreement at all? Are the Instagram posts...

If this is solely artwork and the person's name, image or likeness is not being used to sell or promote a good or service (that is not the specific...

Can I make up a domain similar to Kylie cosmetics and sell beauty products if i spell it differently?

Merely misspelling the trademark will not help you if you are otherwise infringing on it. But there are ways in which you can use another's...

"Fan art" is really just a nice way of saying "moderately tolerated copyright infringement." Most content creators and owners will not prosecute...

I think the biggest issue is likely the trademark infringement concerns. You may be seen as presenting a false association, sponsorship,...

As an undergrad student, if I record a music album using my university's pianos, can the university claim to own copyright?

The fact that you used their piano or other instruments should have zero effect on copyright ownership. This is not something I would be concerned...

Can I use public domain for commercial purposes?

You didn't really state your specific purpose for this, but as noted the important issue here is likely trademark infringement because you may be...