With the tasks app, you can

• add and delete tasks, edit their title, description, start and due dates and reminder times, mark them as important and add comments to them.
• share tasks between users.
• synchronise tasks by using the CalDav tool (Each task list is linked to a Nextcloud calendar. To synchronise it with your local client - Thunderbird, Evolution, KDE Kontact, iCal… - just add the calendar as a remote calendar to you client.).

Tasks App

With a web browser, you can have access to https://ccs.jade-hs.de/apps/tasks/ the WebApp “tasks” in the collaboration cloud.

F-Droid App Store: Tasks

Google Play Store: Open Tasks

The use is self-descriptive.