It is not snapping at all. Why is that?

are you using the correct blender version? 

the tutorial is from the 2.7 version and the ucrrent blender is 2.8

they have different snapping settings/workflows

Thanks for the information. Could show the snapping settings/workflows

hey sorry 

could you be more precise with your second phrase pls? I am not sure what you are asking,

https://www.youtube.com/watch?v=RUXZrxHB2Gw may be this helps

ok then