Are Instances Bad?

Are instances bad when creating a Roblox game? Is their a limit before the performance gets sloppy?

Instances are everything you see in ROBLOX, so no.

Instance is the base class of every object. It depends on what you do with them. For example, you don’t want so many parts that everybody lags.

I’d advise you read through the documentation for it: Instance | Documentation - Roblox Creator Hub