Setting an Infinite Particle
When setting an infinite particle, we are most likely spawning a burst sprite/mesh particle. A problem I've come across myself is how do I make this live forever, I can't just set my lifetime to 100+?
You'll notice if you set you emitter behaviour to Once and Infinite, your particle will die after it's lifetime value
A common 'mistake' people tend to make is setting the particle state to infinite, but this can cause bugs because it makes it so the particle will never despawn
It's better practice to set your particle lifetime to CurrentLoopDuration > this can be of the Emitter or System.
You just need to ensure your Emitter/System is set up to loop once and infinitely
Infinite Emitter
Infinite System