It's reasonably unexciting but I am writing an article about "What I wish I had known before starting my custom software development agency"...
I know, I know - those titles are kinda lame - but it captures it pretty well, as the piece is about a younger me (8 years ago) being visited by an older, wider, and slightly fatter me, and imparting some key learnings about the world of client services, and more generally running a custom software business.
It's for my new blog/newsletter/website Dev to Agency (https://www.devtoagency.com) where I am trying to help full-stack developers that may wish the start a software agency get started, and hopefully teach them a few things.