About voltage and capacitance

Hi everybody, I'm new at the forum. I've started learning physics on my school last year.

I've a question.

How can we measure the voltage stated on the definition of capacitance? Just V=Q/C ?

Or how to measure the capacitance? What's about voltage?

I didn't know that Q=C.V. What is that? The definition of capacitance, voltage or electric charge?

Generally I didn't understand that. Can you help me please?

I'm sorry for my bad English.