There's a "sticky" right at the top of the forum that goes into a lot of detail about it... See:
https://photography-on-the.net/forum/showthread.php?t=807555
I don't generally use a filter. All DSLRs already have built in UV filtration, so the only purpose is "proteckshun". Personally I think it's sort of silly to expect a thin piece of glass to provide much meaningful protection... though sales people in the store will tell you it's essential, I'm sure.
When shooting, use a lens hood. When storing the lens, use a lens cap. Either will give better protection in most situations. In fact, when using a filter, it's even more important to use a hood.
I shot an event last weekend with another photographer who was using a 70-200/2.8 IS exactly like mine and have spent four days editing 6000+ images (shot by five of us). I've noticed all his shots have much more chromatic aberration than mine. I suspect he has a filter on his lens.
I do have protection filters to fit all my lenses, and they are stored separately in my camera bag until actually needed. I'll use them in sandstorms, when shooting near the surf (salt spray), maybe a few other risky situations when they might actually be of some help. But most of the time, my lenses are bare naked and I've yet to ever have one get damaged in any way that a filter might have prevented (30+ years shooting and dozens of different lens over the years).