To use your checklist, simply work your way through it in order, dealing with the A priority tasks first, then the Bs, then the Cs, and so on. As you complete tasks, tick them off or strike them through.
In the professional world, checklists are a huge component to the daily work of pilots and surgeons. Detailed step-by-step checklists help fight complacency in the cockpit, and maintain safe operation of the aircraft during all phases of flight, from gate to gate. In hospitals, medical teams use checklists to ensure surgical procedures go smoothly.
Run through these checklists allocating priorities from A (very important, or very urgent) to F (unimportant, or not at all urgent). If too many tasks have a high priority, run through the list again and demote the less important ones. Once you have done this, rewrite the list in priority order.
Task checklist have each step written in details which need to be followed in chronological order. While To-do checklist include a list of personal things that need to be done one after the other or simultaneously over a fixed time period.