P7: Use Prepositions Properly: Use prepositions according to their meaning and for proper idiomatic phrases: https://academicguides.waldenu.edu/writingcenter/grammar/prepositions
See the online link, but here is a common problem:
“On” refers to the surface, while “in” refers to being inside something.
Tami was involved on a meeting when Frank arrived. – Incorrect
Tami was involved in a meeting when Frank arrived. – Correct
Stan stood in the observation deck overlooking the city. – Incorrect
Stan stood on the observation deck overlooking the city. – Correct