In GTG, you use tags to sort your tasks. A tag is a simple word that begins with "@".
Try to type a word beginning with "@" here:
Once it becomes yellow, it is a tag! And this tag is now linked to the task!
Using the View menu, you can enable a sidebar which displays all the tags you are using. This allows you to easily see all tasks associated to a given tag.
If you right-click on a tag in the sidebar, you can also edit it. It allows you to assign it a color or an icon for instance. This is handy if you want to quickly identify the tasks associated to a given tag in the task list!
New tags are always added exclusively to the currently edited task, and never to its subtasks. However, when you create a new subtask, it will inherit its parent's tags.
If you need a more advanced task organization, you can also create a hierarchy of tags by drag-and-dropping a tag onto another. This is useful when you want to regroup several tags together and see all related tasks easily. For instance, if you have two tags @money and @to_pay, and you drag @to_pay on @money, every task tagged with @to_pay will also appear when you select @money.
