You can get to the task details by clicking on a task in a task list, the dashboard widget or notification.
Edit base data
Now you can edit the task name, description, assign tags or move the task to another list.
Subtasks, Deadline & Progress
To add a subtask you just click on "Add subtask" and type the name of the task. Subtasks don't have their own deadline or assignee. You can also add a due date and set the planned effort for the task.
Files can be uploaded to the task directly or in the activity log (see below). To upload a file, click on "Upload Attachment" or drag & drop the file into your browser.
You can track every change of the task and create comments (try also to tag other users via @ ) in the activity log. You can also add files to the task via a comment by uploading the file within your comment. It will also show a preview in the activity log.
Change task status & track time
On the very top you can switch the task status and start the timer for the task.
Notifications & other settings
In the top right corner, you can enable / disable notifications for a task or set it as priority. You can also click on the three dots the get to further actions: