how to use vision properly?

hi, i'd still consider myself relatively new to LoL and so far i have basically only played AI games because my computer is broken and i can't play pvp without a 5 second lag delay , but for the few pvp games which i have done, i have always had people asking me why i didn't have a vision score. i get a new laptop next week and i'm gonna get into ranked when i do, so can someone explain vision/wards to me, how they work and how to use them best to help my team so i don't mess it up? thank u. {{item:3340}} {{item:2055}} {{item:2057}}
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