What is the meaning of “validity of the visa”?
“Validity of the visa” means the date of first possible entry and the latest date your should depart from the Schengen States.
Where do I find the duration of validity on the visa sticker?
If you look at the visa sticker in line 2 ‘from … to’ this is the validity of the visa.
How or where do I find the permitted duration of stay in the visa sticker?
If you look in line 3 under ‘duration of stay’ you will find a number. This is the duration of the legal stay with this visa in the Schengen States.