I am very ignorant when it comes to setting up the strings for the search query in Smart Lists and hoping to get some help.

I would like to search for tasks with no due date, (I got that figured out) and omitting subtasks, (the part I cannot figure out).

I don’t want subtasks showing, as most of my subtasks are not dated, thus showing up when I attempted this.

Any help would be great,
Thx