Todoist is another candidate to ease your life. It is a pretty versatile task-list-manager. Yet, there is a bit of poison in this choice: this thing constantly nags to get a premium subscription. All the functionality is always present in terms of buttons and icons, you click the wrong one, you earn another popup informing you that you should order a premium account. Nevertheless, it is worth the pain …
Once you get over with being annoyed, it turns out to be a pretty usable tool … with or without the premium features, this is just a matter of personal preference. I stayed free on this one, as e.g. for a project I usually have a plan in Evernote, so I only need Todoist to manage that plan. Explanations in Todoist are not necessary for me, and do not seem overly beneficial to my use-case: an explanation in Todoist gets archived (as in “lost”), once the job is done. The explanation in Evernote stays available and findable!
Anyway: Todoist is a great place to organise and order tasks: prios, deadlines, project-hierarchies … all this is in the free version. Comments are not, but then there is Evernote.
One thing: Todoist sends a daily digest of tasks that are due or over-due. Pretty helpful to kick your own butt, if needed! For me it is a good way for a reminder, so I do not lose a project. I can postpone it at any time to any time, but it does not get lost.