Here are a few of my books that are available as free pdf downloads and free multi-touch iBooks on Apple's iBooks Store. Some are also available as (paid) printed books on Amazon.
Logic Pro X - What's New in 10.3.2
Logic Pro X - What's New in 10.2.3
Logic Pro X - What's New in 10.2.1
Logic Pro X - 10.2 Undocumented Changes
Logic Pro X - 10.1 New Features
Logic Pro X - Automation 10.1
GarageBand X - How it Works (Light )
VCV Rack - How it Works
Zoom.us - How it Works, especially with DAWs and Audio Collaboration
Pro Tools 2020 - Groups
This is the comple 60 pages chapter #14 "Groups" from the book "Pro Tools 2020 - How it Works"