Simply list everything that needs to be done. Let one item remind you of others. Use a checklist if needed. As you go along put a circle in front of each item. Then put a number or a letter to signify the priority of the item.
Most people have trouble deciding on just what is really important.
Priorities can be set for each of your objectives. This tells you what's important. Now, attention, time, and effort will be aimed at these top goals. They will be done first. You are managing your resources according to the objectives of the project or company.