Keeping track of ideas. 
There are many ways of keeping track of ideas that come to you, business related or not. I have found that I personally try to keep it in my head by rethinking the idea over and over. When that route is not good enough I try to jot down a note in the notes app on my cell phone since it is always on me. There are other methods such as notebooks and other devices a lot of it is just having your method of remembering readily accessible.