These warnings are telling you that you have multiple sources for Brave Browser added.
Sources are kept in root, in /etc/apt/sources.list.d
All you need to do is remove the duplicates.
You can do this by elevating your file manager to root, then following the tree to /etc/apt/sources.list.d and manually removing the duplicates or by launching Software & Updates > Other Software tab, then marking the duplicate Brave Browser sources and clicking Remove.
From what I can tell it looks like whilst Brave is available by Zorin there is an issue with update sources. My personal preference is to use zen browser, a fork of Firefox. I downloafed the tarball, extracted it and launch it initially from the extracted contents then pin to Dash (bottom panel). And in the same way firefox would update via help | about zen installs updates that way. A much cleaner experience for me.
I looked at my installation and don't have brave-browser-release.sources. I think you can delete this one.
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I endorse this statement.
brave-browser-release.list and brave-browser-release.list.save are all that is needed. And really, only brave-browser-release.list is...
I can confirm this.
@morta: Type in the Terminal sudo rm /etc/apt/sources.list.d/brave-browser-release.sources to delete the File. After that make a sudo apt update && sudo apt upgrade and it should be normal again.
That looks all right. The last yellow warning there has to do with the computer architecture, nothing to worry about. You can make it go away:
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Yes, this looks all good. The yellow N Warning is nothing dramatic. It is a little Configuration Thing. If You want to have it gone, follow @zenzen's Link with the Description.