Inoreader tags are one of the best features of Inoreader! Any Inoreader item can have multiple tags, and you can use those tags both to organize your reading experience and also to export posts with a particular tag. I'll say more about exporting later; in this post, I'll focus on how you assign tags to post and how that can support your use of content inside Inoreader.
Folders and tags. When you look at an item in Inoreader from a feed that you have put in a Folder, you will see the Folder name as a tag! So, if you are using Folders, that means you are already using Inoreader tags. Just look at the bottom of any Inoreader item, and you'll see the tag(s) there, starting with the Folder name as a tag:
Adding tags. As you add tags to items, you will then see those tags show up in the left-hand navigation panel up at the top, above the folders, so that you can then browse by tags the same way that you can browse by folders and by feeds.
Tags for workflow. If you look at the screenshot above, you'll see a tag that says "problem" which is an example of how I use tags for workflow: when I see a student blog post that has a problem (like a hot-linked image that needs fixing), I just add the tag "problem" to the item, and then later on during the day when I have time I'll go through those posts, contacting students as needed, and then removing the "problem" tag as I do. That's just one example; I use tags like that constantly in Inoreader for all kinds of purposes, putting posts together in tagged collections that I need to work on for whatever reason.
So, you can use tags manually, but you can also use rules to assign tags; that's what we'll look at next: Inoreader Rules.