4 Common DM Mistakes (And How to Avoid Them)
 
http://taking10.blogspot.com/2015/08/4-common-dm-mistakes-and-how-to-avoid.html

Being a DM isn't easy. However, beginning DMs are prone to a lot of simple mistakes that can easily be avoided. Here are 4 of the big ones that you'll want to sidestep in your campaign, and suggestions for alternative ways to handle the situation.