Italy Visa?

No visa necessary for a typical tourist visit
Obviously you need a passport that is valid for a certain amount of time past your trip
Sorry don’t know the exact ( 6 months?)

You will need to comply with whatever COVID restrictions/ requirements are in place at the time of your trip

Start here and if you haven’t purchased RS Italy guidebook yet, I highly recommend
Or if you are really only going to Venice just get the Venice pocket guide

https://www.ricksteves.com/travel-tips/trip-planning/travel-documents

You do not need to have a visa to travel to Italy at the current time. However, you may stay no longer than 90 days, including arrival and departure days, in any European country within the Schengen zone. If you do not know what this is, you can Google it, but basically it involves most continental European countries. As pointed out by Christine H above, you will need to make certain that your passports are good for a minimum of six months after your scheduled return. The visa situation may change, as there is talk of this, but certainly not within the next year.

I also emphatically second the advice to you get hold of a Rick Steves travel guide. The Italy general guide will give you a good bit of information that you can use no matter where you go in Italy, and, as noted above, there is also a smaller guide specific to Venice that you probably should have as well. You can generally borrow these books at your public library for free if you don’t want to purchase them.

I wonder if the OP is confusing a visa with the ETIAS. But since the latter has been postponed to the end of 2022, and may be postponed still further, it likely shouldnt be a factor either.