Why do you hear popping when you listen to vinyls?

Because it's a very crappy format.

Dust? I love that sound.

Various reasons. In cheaper pressings of older albums sometimes the pop actually comes from pieces of label paper melted into recycled vinyl.

Idk, probably the irregularities in the ridges? Vynils can get damaged after a while and even skip lanes (or however they're caller the song ridges)

if it happens at 2 second intervals probably a scratch:

Scratch on vinyl itself or dusty stylus?

Static i guess.. maybe dust on the ridges? Idk

the speakers need dusting,

Not as much as when I was a kid.