I bought your book. I am just starting out as a backend developer. Titles like these are badly needed. But your book needs a lot more polish. There were typos in a lot of places. Also it would have been great if you could cover Ubuntu. It's a lot of effort to map fedora commands to that.

Finally, compared to what you are charging for your book, The Unix and Linux System Administrator's Handbook costs 60 USD, covers way more, in better detail, and has much better presentation. The advantage your product should have is much more focus on backend deployments but it falls short in the quality of coverage and by extension, ease of use (for newbs).