Hello again!
I’m currently still working hard on my project and learned lots of basic things!
I’m making an invisible part that spawns in smoke but i want to make it where you walk into the part and it makes it foggier, i also want it to play a short song when you walk into it aswell! So it’s making the smoke an annoyance 
How can i do this?
Cheers 
Just use a gray BasePart instance with its transparency set to some value (low for high fog, high for low fog).
The in-built fog system can still be used, since it can be adjusted during runtime. Just keep in mind that if you want it to not be universal (foggy only for some players not all) then you’ll need each client to adjust the fog values (located in lighting) through a local script so that the values are only changed locally. If you have a server script set up for the Touch events, you’ll need to use remote events for the client to enable fog on the client side.