Write stuff down.
I say it over and over again. I repeat myself. My blog is an extension of my habit of writing down ideas.
A short pencil is longer than the longest memory.
“Writing is among the greatest inventions in human history, perhaps the greatest invention, since it made history possible. Yet it is a skill most of us take for granted.” Andrew Robinson, The Story of Writing.
Check out how to begin with a journal, or hear what Jim Collins has to say on the writing process.