Wagtail CMS is Python and Django's #1 most popular content management system (CMS). It's flexible, extendable, and easy to maintain. None of the WordPress nightmares you've heard about exist with Wagtail, which is a thing of beauty by itself.
There's a lot of skilled people with different talent on the core team. I'm one of the lucky few who get to sit on the core development team but I will admit I'm not nearly as skilled as some of the other core members. However I do offer a lot of Wagtail training. Learn Wagtail.com and the 60+ free videos on YouTube are the largest collections of knowledge to learn Wagtail CMS - and that's where I come in, that's my project.
I also provide support to clients who need custom Wagtail features or would like a feature added to the Wagtail core codebase.