Validation is useful as a tool, but not all websites need to validate perfectly for them to run well.
I took a look at your site’s validation. Nothing on there is too concerning. Plus, as you set up your site, some of them may disappear. You can spend the time to make your website validate perfectly, but in most cases it isn’t worth it. Just look at your website on a variety of different web browsers on Mac and PC and if you’re happy with how it looks, leave it.