You can assign colored tags with the number keys on the keyboard:

https://www.zotero.org/support/collections_and_tags#colored_tags

For other tags, there's no shortcut, so the best you could do currently is use the keyboard to navigate to the Tags pane — e.g., Tab, right-arrow, right-arrow, Tab, spacebar (on the Add button), add tags. The tags pane does stay open between items, though, so if you were adding tags to multiple items it would just be Tab, Tab, spacebar, add tags, and then when you're done use the arrow keys to move to another item.

You could also use some macro program that performed the above steps (e.g., Keyboard Maestro on macOS).

In terms of improving this, I could see there being a keyboard shortcut — maybe Shift-T — that would automatically select the Tags pane and activate a new row. It could alternatively show some sort of floating panel with the tags box that went away when done, which would be a bit more complicated to implement but would have the advantage of not changing the selection in the right-hand pane.

Thanks to both. I know about the coloured tags. As for improvements, a shortcut moving the cursor to the Tags pane would already make things easier. The second solution would be just perfect. The thing is that dragging items to the tag selector takes too much time and patience, especially on a laptop.

It's a many-to-one relationship with no inherent order and no limit on the number of tags that can be present on an item, so showing it in a column of limited width doesn't really make sense conceptually.

These preferences and Zotero's preferences are stored in the prefs.js file in your Zotero profile directory: https://www.zotero.org/support/kb/profile_directory

Hello,

I'm also interested in display some informations about tags in the main window. Maybe would it be great to have a column "Number of tags". Do you know if it's possible ?

Thanks you !

Theo