According to Fastcompany.com, your to-do list should not contain the following tasks.
1. Regular and mechanical tasks
These are your everyday activities such as reading e-mail or attending morning meetings. It's useless to write down tasks you'll do irrespective of whether you write them on your list.
2. Tasks you constantly procrastinate
If your to-do list includes a task that you keep on postponing, it's probably a task you'll never do. Delete it and don't stress yourself about it any longer.
3. Tasks you can delegate
You don't have to do everything yourself. Delegation is one of the most effective techniques to be happier and more successful.
4. Five-minute tasks
If you can finish a task in five minutes, do it right away and don't write it down.
5. Long-term projects
Long-term projects usually remain on the very bottom of to-do lists until the moment the deadlines are approaching and you really have to start working on them.
These tasks keep stressing you the whole time. Divide them into smaller parts to schedule.
6. Too many tasks
The length of your to-do list should not discourage you from starting to work on them. Write down only as many tasks you can really do that day or week.
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