QUES: Books III IV and V treat spherical trigonometry which of course is of major importance in astronomy

correct the punctuation.

CORRECTED: Books III, IV and V treat spherical trigonometry which, of course, is of major importance in astronomy.

QUES: It has high antifungal and antibacterial components

correct the punctuation.

CORRECTED: It has high antifungal and anti-bacterial components.

QUES: Many teams use our tools and equipments at events such as the UAE Desert Challenge in Dubai or the world famous legendary rallye DAKAR

correct the punctuation.

CORRECTED:
Many teams use our tools and equipments at events such as the UAE Desert Challenge in Dubai or the world famous legendary rallye "DAKAR".