I think that the only way to be certain what each task does is to check the code. Where that screen shows a task name like \auth_db\task\sync_users, then you can find the code for that in auth/db/classes/task/sync_users.php. If you are lucky, there will be a comment at the top of that file saying what the task does. If you are unlucky, you well need to read the code.
General developer forum
How to know the business of all of Adhoc and schedule tasks
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