There are some resources posted at business schools, where Bloomberg Terminal usage is frequently part of coursework [1, 2, 3]. Also the "Bloomberg Markets" magazine (frequently sold in major airports) covers new terminal features and shows how to use the terminal to analyze trending financial topics.
[1] http://businesslibrary.uflib.ufl.edu/c.php?g=114612&p=746563 [2] https://business.sdsu.edu/_resources/files/wffmlab/guides/la... [3] https://www.youtube.com/watch?v=anOUEiraEtg