I had an idea for a long post about some lessons I recently learned, but then I realized something. The biggest improvement I feel I've made as a GM lately came from this video. How often do you consider the verbs you use when giving your players tasks? RPGs are fond of "What do you do?" but that question can be daunting with its openness if a good mission isn't set before the PCs, and a good mission has a good verb.
Watch this. Digest it. Consider it when planning your sessions. You might be surprised how much better your sessions go when "Find information on the missing Count of House Antioch" becomes "Recover the Book of Fallen Leaves, a detailed History and Study of House Antioch."
But I'll let you watch for yourself below.