Hello @amp834 !

Welcome to aboard! Let's review your list. Note that most of them have been described here, on the forum or in the docs pages.

>- When customizing/editing pages like: about, terms, privacy, and menu items in system header, how to do it.

It is possible to do via the Polyglot app

>so if I update UNA, it doesn't overwrite my changes.

Yes, all your Studio changes will not be touched by the upgrade process.

>Studio, Navigation | system | footer, items listed as "Language" and "Template" do not show up (I'm logged to UNA as una admin account)

If you have only 1 language and 1 template / them then those menu items will not be shown.

- create profile, I upload a profile photo, it goes through as if ok, then shows a broken link where the photo should be

This fix may help https://unacms.com/cmts-view/z9tfe0?sys=bx_forum&cmt_id=43244

>I can disable the "info" block by editing the page. What happens when I update the software, will I lose my changes?

No, the upgrade doesn't affect on the Pages app settings.

About possible bugs please PM me with your UNA studio access.