Is there a section dedicated to grammar rules and exceptions?

WaniKani doesn’t offer this as part of the platform, but there are plenty of great services like BunPro that do offer grammar lessons, you’ll find some useful link below…

\textcolor{pink}{\huge \textsf{WELCOME! ^-^}}

welcome gif - crabigator

Take the time to check out the FAQ and GUIDE if you haven’t already.

There’s also a lot of good stuff on the forum to help you, like:

The Ultimate Guide for WK
The Ultimate Additional Japanese Resource List
The New and Improved List of API and Third-Party Apps

I hope your Japanese learning journey goes well and that you enjoy your time with us on the forums.