How to add tags to a task?
Tags let you search across multiple lists for tasks that share common tags. This allows for a faceted search of your information. To activate this feature, you must first enable "Tags" in the "Labs" menu. Here's how:
Sign in to TickTick on the web.
Click the avatar in the upper-left corner of your TickTick homepage, then click "Settings" from the menu that appears.
Click "Smart List" in the left panel, and enable "Tags" in the right panel.
To tag a task item, simply add a hashtag to a keyword in that item (for example, #Holiday). You may use a maximum of five tags per task.
You can view a list of the tags you've created in the "Tags" list in the sidebar.