Shirk can be in Ruboobiyyah, Asma was-Sifaat, and Uluhiyyah.
Shirk in Ruboobiyyah
There are two kinds:
1] Shirk Ta'teel: Denying Allah
An example of one who committed this type of shirk is Fir'awn.
قَالَ فِرْعَوْنُ وَمَا رَبُّ الْعَالَمِينَ
"Fir'aun (Pharaoh) said: "And what ...