You can call me old school, meaning, my team and I do use Photoshop to create our product covers and bundle covers.
Though, Photoshop is not easy to use and does take a long time in learning how to use it (the cost is not cheap).
That’s why I recommend either Designrr or Sqribble because they’re both user friendly, especially for people who are starting out. Plus, they have a one-time price, not like Photoshop.
I have personally used both of them to test them out and I can say, they’re really greate tools and I wish they were out years ago when I first started out.
I hope this helps.
"The path to success is to take massive, determined action".