There are quite a few resources out there that can help you improve your technical writing skills. I will list some of my favorites here in the hopes that these resources will help other authors and technical editors.
Microsoft Writing Style Guide
The Writing Style Guide is available online and in a book format. It helps to ensure that you are using industry accepted language and is an excellent resource, regardless of whether you are writing a book on Microsoft products or some other technology.
Online Version: https://docs.microsoft.com/en-us/style-guide/welcome/
Book Version: Microsoft Manual of Style (4th Edition) (ISBN-13: 978-0735648715)
Society for Technical Communications
This organization offers webinars, classes, and digital and print versions of their journals. Regardless of whether you are just starting out with writing, or have been writing for a long time, you will find value with this org.
You can access their site here: https://www.stc.org/
