Within a note, press the pound/hashtag symbol (#) and start typing your tag

Select the tag that you would like to add. If the tag you want doesn't exist, create a new one (see below for more details)

Hover over the tag that you would like to edit. Click on edit

Edit the content of your tag. Press Save

You also have the option to edit a tag by clicking on the pencil icon next to the tag you want in Workspace Settings.

Hover over the tag that you would like to star. Click on add to home panel then choose the group you'd like to include it in

Once starred, this tag will appear under the category you've select in your home panel

You also have the option to star a tag by clicking on the triple dot menu next to the tag you want in Workspace Settings.

Click on the tag in the note. This will then show you all the content that you have access to where that tag is applied.

Search for that tag directly in the main search panel or search directly in your My Action Items section.