Craft 5 Guide: From Installation to Feature Exploration
I kicked off a new course to help us all get more familiar with the upcoming major version of Craft CMS. We're still a ways off from the Craft 5 release, but you can still learn what's coming by installing the alpha version and kicking the tires.
I added a new video to this series covering the `join` filter. It's one of the simpler filters but you'll often see it used in conjunction with another filter, like `map` to prepare the output for rendering via Twig.