Why this exists
When things are spread out, they get forgotten. Operations Hub began as a student's attempt to fix that: one screen with the tasks, classes, notes and plans that otherwise live in ten different apps.
Studying became the center of it. AI can turn notes into practice questions in seconds, but a confident wrong answer key does real harm: you learn the wrong thing and trust it. So every question here has to point to the line it came from and survive a second reader that never saw the answer. When the checks can't vouch for a question, it isn't shown.
The second idea is that your things belong on your computer. The hub runs there, the private parts never leave it, and you can take everything with you at any time as ordinary files.
It's built and supported by one person, which means the person answering your email is the person who can fix the problem.