Like does the chance for an ability to proc increase as the item level increases?
When you look at you item, there is an icon on either side of the skill description. The left is highlighted and below shows its effects. The right is not highlighted and has a lock symbol. Click on that icon and it will show you the level when an improvement in the effects will take place and what the new effects will be.
It’s a good idea to click on everything you see on the screen. The big number upper most left of every screen for example. The badge to the left of your guild name. Just click on everything