Tags in Wordpress

[shahid1]

Mujhe wordpress expert se aik help chayie, Wo ye ke wordpress per bani site main tags ka istmal kaise kya jata hai?

Kya jab google category ke data ko kisi tag ke saath bhi find karti hai to usse duplicate content nahi samjhti?

Kya ham category 1 ki post ko dye gaye tag to category 2 ki post per bhi laga sakte hain?

Plz guide me
thanks

[Derwaish]

brother aap yeh link check karey shayeed aap ki help ho jaye link