I don't know if this counts as "an easy way to help me remember", but here are some nicely presented taböes showing the locatives, with explanations and example sentences. Hope it helps!

https://www2.ku.edu/~kiswahili/pdfs/lesson_40.pdf

Once upon a time, Duolingo gave us notifications when someone replied to us, but now it doesn't ... so I would say "Feel free to ask me any questions!", but I you probably won't see this post and even if you do and reply to it, I probably won't see that.