Confluence - what are the features of the dashboard?

I am new to Confluence and the capacitation is still to come. Could you explain to me the features of the dashboard?

Is there any guide or tutorial for that?

You can check the Atlassian documentation for Confluence. This is the link to the dashboard info:

https://confluence.atlassian.com/doc/the-dashboard-139374.html

And here you got the overview of all help subjects: https://confluence.atlassian.com/doc/confluence-server-documentation-135922.html