Is it true that mole is the unit of quantity of matter? What is the quantity unit and how does it differ from the unit? Is it true that mole is the unit of quantity of matter? What is a quantity unit and how does it differ from a unit?

No. Mole is the unit of quantity of matter, not the unit of quantity.
The unit of measure is wide and the unit of measure is included in the unit of measure.
For example:
Qty Unit: double-pair cassette Weight Unit: g Kg Dt Length Unit: nanometer millimeter decimeter kilometer kilometer meter Area Unit: square millimeter square decimeter square square kilometer volume Unit: cubic millimeter cubic decimeter

The cover of a math textbook is about 480() What quantity units are filled in

The cover of a math textbook is about 480 square centimeters

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