Eva is doing a publishing project, but her computer is 12 years old. So she's looking for user-friendly design software. Leo says that Serif is a solid company that used to make desktop publishing software and now have a low-cost app called Affinity Publisher. It's $25. Leo uses Affinity Photo, and he likes it. So Publisher may be a good one to look into, and they have a 90 day try before you buy.
From the chatroom - Check out Vellum. It's designed for eBook creation. It's a bit more at $250, but it's designed to layout your books just like publishers do.