How to change debian repository

repository is an additional package for Linux distributions so that the system runs well
 OK.. let's to the point
 type "/etc/apt/sources.list" in the terminal
 exalmple sorces.list for debian 9 stretch indonesian

deb http://kambing.ui.ac.id/debian/ stretch main contrib non-free
deb http://kambing.ui.ac.id/debian/ stretch-update main contrib non-free 
deb http://kambing.ui.ac.id/debian-security/ stretch/update main contrib non-free

You can change to your local repository or you can click this link if you not understand with my blog
OK... thanks for reading
I hope my blog is useful
see you later