No worries @hanjae87 , it’s a hidden file which makes it confusing.
It’s a file at the same level as .obsidian (root folder with the rest of your notes)
It follows the same concepts as the .obsidian folder, but the .obsidian.vimrc is a file not a folder.
I wrote a blogpost on .obsdian so it’s not exactly the same, but it will definitely help you out
Let me know if you got any questions, since I know these things can be confusing