Vim reads configuration from a .vimrc file. Vim works out of the box, but there are certain options which make working with code a lot easier.
In Linux and MacOS, .vimrc is located in your user directory (the full path would be /home/<username>/.vimrc). You can also find out your user directory by opening a Command Prompt and running the following command:
$ echo $HOME
Windows does not allow periods in file names, so the file is named _vimrc. It's usually located in C:\Users\<username>\_vimrc, but you can also locate it by opening the Windows Command Prompt and running the following command:
$ echo %USERPROFILE% ...