Canva has a lot of bells and whistles, which makes it a little intimidating, but it's really not hard to use at all AND most of the best features are available with a free account. If you're wondering whether or not you'll be able to easily use Canva templates to build your family history book, check out this quick walk-through video for an idea of what you'd be doing:
This is the video that comes with every Canva template pack.