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Comments allow project members to communicate with each other. High-level authorities can use them to dispatch orders to their subordinates. Above all, the most important aspect of this feature is that it allows members belonging to different ranks share their ideas, discuss what they are doing, and work towards the betterment of the project.
To add a comment,
Open the details page of the required project/milestone/task.
Go to Comments and add your comment in the text box provided. [OR]
Click Actions >> Add Comment.
Enter your comment. Apply formatting or include images and videos if required.
Click Add Comment to complete the action.
To edit a comment, hover the mouse pointer over the required comment and click .
To delete a comment, hover over the required comment and click 
.
You can add replies to a comment from the details page.
To add a reply,
Hover over the required comment and click 
.
In the displayed editor, enter your reply. Include images or videos if any.
Click Add Reply to complete the action.
You can display comments in two different views,
Linear View: This view displays comments and replies as a single list with the latest comment/reply at the top.
Each comment will be displayed as a plain text trimmed to the first 250 characters. Click
to view the full content in rich text format.
You can tag project members or users who can access projects in the comments section. To tag a user, type @ followed by their user name. A list of users matching the user name will be displayed from which you can choose the required user.
Similarly, you can also tag the task/milestone/project owner and the task group by typing @TASK_OWNER/@MILESTONE_OWNER/@PROJECT_OWNER and @TASK_GROUP variables respectively.
You can notify users when they are tagged in a comment. Configure this under Setup >> Automation >> Notification Rules. Tagging the task group will notify all the group members.
History tab lets you view all the events that occur within a project. It lets you know 'who does what and at what time'. To access a project's history click the History tab.
