If you want to have all your tasks organized with a powerful tool that is easy to use and that moreover, has an appealing interface, the answer is Things.
One of the best programs to create notes on macOS
This program was prized by Apple in the 2009 Design Awards, and for all the right reasons, because as well as being very practical, Things stands out due to its extraordinarily elegant design.
The strong point of Things, besides elegance, is its intuitive handling. It allows you to organize to-do's into categories, see a list of outstanding tasks, assign tasks to different members of the work group, easily make notes, alternate between several visualization modes, etc.
As if this wasn't enough, the latest versions of the application allow us to synchronize between our Mac and our iPod/iPhone, both the projects as well as the to-do lists.
Forget about sticky notes, now the best way to have your tasks nicely organized is Things. Download it right now!