I may have missed this somewhere along the conversation thread but would you mind to explain the process of writing the eBooks from publishing perspective? (i.

I may have missed this somewhere along the conversation thread but would you mind to explain the process of writing the eBooks from publishing perspective? (i.e.: the tools, the output format, what are the considerations for various devices, etc) Do you write using a tool that can produce outputs of multiple formats or that can fit to multiple devices?