Product Design is an engineering process. It is not just about drawing a beautiful user interface, it is about building a solution to a user's need. It is a succession of logical steps in thinking and writing, which I recommend to browse through sequentially. And the best approach to my experience is going top down.
Proper tooling can be extremely helpful for a Product Manager. And it's always hard to find exactly what you need. I'll be discussing the tools I used, what I liked and disliked about them. What are your thoughts?