Every aspect of your life is complex. Every single task is built from other tasks. Let say you running a company (its a task). it requires from you to create a website (its another task), do negotiations, accounting, management and so forth. But let's go even deeper, creating a website requires from you, preparing a content like a text, do a photo session, do Google Ads and SEO. So as You see, in TODO GO you don't need to waste time to create things like categories. Tasks become categories if you will add task inside of these tasks. Everything happens in fly - automatically, whiteout wasting your time.
What is most important all task structure is multidimensional. You don't need to scroll through the entire list and categories to find a specific task. In just a few simple taps you can get exactly wherever you want.
TODO GO providing also very basic but helpful features. You can set remainder in certain date and time and If the task is done, you can simply mark as done or remove.
Using TODO go you can organize your duties beautifully, in the most logical and efficient way.