Project tasks are tasks which have been assigned to you in a project project. They may have assigned to you by yourself, or to you by someone else.
Likewise, you may also assign tasks to another teammate.
More information about this is covered in the lesson on How to assign a task.
When you are assigned a project task through a project, the task also automatically appears in your to-do list (1).
It will also be visible in your personal calendar and indicated by a red bar (2).
All personal tasks you create in your calendar are represented by a blue bar (3).
Once an assignment is complete, it will be crossed out on your calendar.