To create the covers from my books and guided meditations, I use the Affinity tools: Designer and Photo. To lay out my books and get them ready for publication, I use Publisher.
These are relatively new applications by Serif in the UK. They are inexpensive. Best of all, they are NOT on a subscription basis. Many Adobe users have switched to Affinity.
I love these programs. They are relatively easy to learn and use and very easy to use if you've already used any similar applications.
They all work together. If you're in one application, you can easily open the same project in another application. For example, if you're in Designer creating a cover and have an image that needs adjusting, you simply go to the Designer File Menu and open Photo. You adjust the image in Photo and then go back to Designer to continue your work.
When I started using Affinity products, I was fairly new to these sorts of applications. Then along came Affinity Revolution -- a husband and wife team, teachers, who created tutorials for all three Affinity applications. They are the best tutorials one could hope to have when learning a new program. I highly recommend them. They are inexpensive and ever so pleasant to watch and learn.
So, if you're looking for a great set of creative applications I highly recommend Affinity products and I highly recommend Affinity Revolution tutorials to quickly and painlessly learn how to use them.