The documented features are in the faq/docs, which are linked at the bottom https://itch.io/docs/general/faq Also helpful for some searches is the https://itch.io/directory at the bottom.
There recently was a sticky posting added with some answers. https://itch.io/t/5805284/useful-answers The sticky thread includes a link to Can I use exclusion filters? Some other links in the sticky posting also deal with features and functions of the site, because people keep asking about those.
If you seek a feature you think should exist, but do not find, a google search might help. Some features are just called differently on Itch. Or work differently. For example, there is no private messaging system. And a game review will not appear on the game page - many people are confused by that.
On a side note, I only discovered that Steam has an exclusion filter through reading discussions on Itch.
