WaniKani is going to show you a lot of different parts of speech, including a lot of different kinds of verbs! (Potential, transitive/intransitive, etc) If you’re already studying grammar outside of WK these verb types will naturally come up in time as you follow a textbook, app, Bunpro, etc.
If you still want to look up specific things like potential verbs, something like Tae Kim’s Guide should be fine. To my knowledge there isn’t a WaniKani-specific list, since the parts of speech you learn here aren’t unique to WK if that makes sense. It sounds like you might benefit from looking into more about Japanese grammar as a whole? You’ll learn that step-by-step as you study grammar, but you can always just google whatever pops up that’s new to you if you’d like to know sooner!
tldr, I personally wouldn’t use WK as a jumping off point for studying grammar points, like verb types. Like you said, they mention things about verbs and adjectives, but there’s a lot more to learn! Things might click a little easier/faster if you study grammar alongside using WK. (You might already be doing this! Apologies if I’m assuming incorrectly.)
Like words ending in い aren’t always adjectives, but perhaps you’ve already looked into i adjectives and na adjectives