it won't be about learning C++ as there are already too many, but it will be more about optimization and performance, from low level code to design decisions.
Ideally the target won't be only experts, but also new programmers who want to learn how to write better code.
If you are writing about "optimization and performance, from low level code to design decisions" why limit yourself to C++? Won't most of what you have to say be language independent?
As you said publishing is not the problem these days (usually), but writing the book will take months of work and I will also need money to buy hardware and software licenses.
Furthermore a crowdfunding campaign can help measuring interest in the project and should also help building a community before the launch.
Hi, I am the author of this tutorial and I would like to mention that while working on it I realised that a proper Hacker News reader would be an interesting project to work on and I might decide to go for it if enough people are interested.
Would you use it on your desktop computer (Linux, OS X and/or Windows)?
If yes, which features would you like to see in the first version?
Android version. Notifications for followed subjects and followed users' comments. Offline mode. Links to the url in the Archive, Google cache, etc. Maybe a tag or icon if the url is a video, pdf, etc or favicon from the website. A sidebar with a list of all the urls posted in the comments for easy.
If I really wanted to be anonymous on GitHub I'd create a "fake" account/would not use my name.