I now use Affinity Publisher for all of my print book formatting as well as my advertisements and book covers. Previously I used Word for non-fiction print formatting, Vellum for novels, and GIMP for any advertisements or covers.
It’s a great tool and I think they have excellent user forums and learning videos on their website (https://affinity.serif.com/en-us/), but for me when I was learning how to use the program, the content wasn’t in an order that made sense for what I needed. So I did a lot of watching and drowning and then finally putting it all together at the end.
To save others who may not be graphic designers but are instead self-publishers looking to master a new tool that same experience, I wrote four books showing how I use Affinity Publisher and then turned those into video courses as well. All the links are below if you’re interested. Use code MLH50 on Teachable to get 50% off.

Video Course: Teachable, Udemy
Ebook: Amazon, Apple, Google, Kobo, Nook, Universal Link
Print Black and White: ISBN 9781637440216
Print Color: ISBN 9781637440681

Video Course: Teachable, Udemy
Ebook: Amazon, Apple, Google, Kobo, Nook, Universal Link
Print Black and White: ISBN 9781637440223
Print Color: ISBN 9781637440711

Video Course: Teachable, Udemy
Ebook: Amazon, Apple, Google, Kobo, Nook, Universal Link
Print Black and White: ISBN 9781637440285
Print Color: ISBN ISBN 9781637440698

Video Course: Teachable, Udemy
Ebook: Amazon, Apple, Google, Kobo, Nook, Universal Link
Print Black and White: ISBN 9781637440292
Print Color: ISBN 9781637440704

Video Course: Teachable