This guide will teach you how to lose your friends! (if you have any)
Step 1: Buy Uno
Step 2: Buy uno to your friends
step 3: Play with them
step 4: Beat them
step 5: Tell them: HAHAHA YOU SUCK, EZ HAHAHA GG
and then you will have no friends! Hope this helped!

Fun Fact: It works for girlfriends too!!