I think the tool tip for Release Frequency in the advanced search is wrong. It says that lower numbers = slower updates, but if you look at WoC, it has a .9 from releasing basically every day, while a series that updates very sporadically has 7.8. From this, it’s clear that lower frequency = faster updates. It could also benefit from an explanation of what exactly the number means. I assume it's "average number of days between releases," but it's not explained in the tool tip.
The Tutorial Is Too Hard, but honestly, any series works. Just pick any two series that release at different rates and you'll see that the faster one has the lower number.