Once a project is completed, we usually offer one rounds of revisions. That's one more chance to make notes on everything you want changed so you're satisfied with the final product. We cannot speak for every company or freelancer, but you should expect 1-3 revisions per project. There are obvious exceptions to this rule, but it gives you a general idea of how many changes you can make. This should all be agreed upon at the start of the project. ‍