I read that you can add sub-tasks but I don't see how to do this nor do I see any solutions in you Help section. Please help! Thanks!
To add a sub-task, please:
1. Enter the project to which you want to add it.
2. Click on "+ Add task" at the bottom of the list.
3. While you'll see the input field opened hover over the 3-tod icon on the right and, among others, you'll see the indent icons there.
Alternatively, you could use Ctrl+RightArrow (or Cmd+RightArrow) to indent a task when editing or adding it this way. Same applies to projects - when editing or adding it, you can create sub-projects.