Scheduler with goals, tasks, subtasks of tasks, as well as subtasks of subtasks?

Question

Task Management

Good day to all.
There are many reasons why I am writing here: a bunch of some tasks, a bunch of forgotten promises, total chaos in general.
I have been living with such a beard since October-November. A lot of things fall down, because of these things, more important things fade into the background, these same things are with a long-term perspective, but I don’t want to for a very long time either.
So soon it will be half a year, it's time to change something.
I wanted to systematize everything a little, conduct an audit of where the time goes, find time for the most necessary tasks, and everything else will somehow work out.
I had high hopes for Outlook, a good mailer, apparently, as an organizer, it should also be good. But, in Outlook, there is no way to create a task with checkboxes, and the task itself can be assigned to some category.
Let's take as an example a student with pairs:
Category UNIVER
Task1: Pass a course in Distributed Computing
Check-box1: lab1
...
Task2: Pay for studies.
Checkbox1: Earn.
Those. basic requirements: categories with tasks and subtasks and cross-platform.

Answer 1

https://workflowy.com/

Answer 2

But, in Outlook, there is no way to create a task with checkboxes, and the task itself can be assigned to some category.

Do you understand that this is MS Office? Why are you trying to replace the simple with the complex? You can write a macro that will count the checkboxes and set the percentage of completion. Or you can just nest one task in another. And about categories - this is generally beyond - press the big button "Select a category" (naturally with the addition and an unlimited number).

Answer 3

Wunderlist or Trello is enough for your tasks. The free functionality of both systems is enough for the eyes.