Rise or raise?

I would like to know the difference between rise and raise.

As verbs, the difference is fairly simple: to rise is an intransitive verb (like alzarsi in Italian): the sun rises at 6, I rise at 8. To raise is a transitive verb and takes an object (like alzare in Italian): We are going to raise the flag, we are going to raise the money for this project.
As nouns, the difference is more complicated: you can get a pay rise and also a raise in salary.