Basal skull view (submentovertical view) X-ray is best to visualize –
Best view for maxillary sinus → Water's view (occipito-mental view)
Best view for frontal sinus     →  Caldwell view (occipito-frontal view)
Best view for sphenoid sinus  →   Basal view (submentovertical view)
Ethmoid sinus
Frontal sinus
Sphenoid sinus
Maxillary sinus