WaniKani in general teaches you the reading that is most useful to know when it teaches you the kanji and then reinforces other common readings with the vocabulary. It’s useful to know what on’yomi and kun’yomi readings are, but not essential to remember which is which for a give kanji.
There’s a great article on Tofugu (WaniKani’s parent site) about readings:
Also, since this is your first post…
\textcolor{pink}{\huge \textsf{WELCOME! ^-^}}
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 Resources 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.