It does not matter if you a top pro fisherman or if you are just a beginner, wearing polarized sunglasses in a big benefit ! Polarized sunglasses will not only protect your eyes from the harmful rays of the sun, but they allow you to see all details no matter what you are looking at. Example: If you are looking at a wooden fence on a sunny day without polarized sunglasses, you will not see details of that fence, but with polarized sunglasses you will see all the grains in the would, scratches and various other details.
This applies while fishing as well, as you will see stumps, sunken tree limbs, rocks and various underwater details you would normally not see due to the glare of the sun.
It is a huge advantage to see underwater details like this as it allows you to observe things like bait fish in the area, structure and even at times fish in that area.
Highly recommend anything into fishing have a decent pair of polarized sunglasses as well as a back up, nothing worse then losing a pair while fishing and having to squint the remainder of the day.