Learn Hardcore Japanese: maturi no yatai de takoyaki wo katte, tomodati to issyo ni tabemasita. - I bought takoyaki at a food stall at the festival and ate it with a friend.

Breakdown of matsuri no yatai de takoyaki o katte, tomodachi to issho ni tabemashita.

What does 祭りの屋台 mean, and why is there a の between 祭り and 屋台?

の links two nouns together. In this sentence, 祭りの屋台 means a festival stall or a food stall at a festival.

This use of の is very common in Japanese. It often works like of, at, or an apostrophe-s in English, depending on the context.

Why is で used after 屋台?

で marks the place where an action happens.

So in 屋台でたこ焼きを買って, で shows that the buying happened at the stall.

Compare:

Here:

Why is を used after たこ焼き?