Organise your notes with tags on iCloud.com
You can use tags as a fast and flexible way to categorise and organise your notes. If you add tags, you can filter them using the Tag Browser on iCloud.com on your computer or in the Notes app on your Apple device.
In Notes on iCloud.com, select a note.
Type the number sign (#), then type a word — for example, #meeting or #important — or choose from the list of suggested tags. (Suggested tags appear if you have already added tags in Notes.)
You can type the tag anywhere in a note. Tags must be a single word, but you can use hyphens and underscores (for example, #meeting-minutes or #important_documents).
If you add a tag to a shared note, it appears as dimmed text to other participants who do not have the tag in their Tag Browser.