How can I familiarize myself with layers?

Discussion created by patrickletg on Aug 25, 2010
Latest reply on Aug 26, 2010 by kirkktx
I am new to this and I want to understand the different layers and file extensions.  So far I've loaded up the .mxd map and that seems to have many layers.  How many different layer types are there?  Do they all have the same file extension?  How can I make my map look like Bing maps?  Any tutorials or links would be great, thanks in advance!