Finally, some prepositions which result in you needing the Locative (Miejszownik) case for the noun in your sentence. Most of these are also shared with the Accusative case, but remember Accusative is all about the motion with respect to a destination, whereas Locative is about the location at which the verb is happening.
Jadę w góry <ACC>
I am going to the mountains
Jestem w górach <LOC>
I am in the mountains
I’ll break down more of the rules for deciding which case to use in a later post, but once again, this post is just to put the prepositions in a group to remember.