I want to start mining. I am new to it and have learnt that i have to use grafic card for making the rig but now i want to know that which grafic card is best, fastest and efficient which i have to buy. There are a lot of varieties of grafic cards but i want to buy the fastest. so that with a few grafic cards i can get a highest hashing power.
You could check how much you can earn per card with Nicehash's Profitability calculator:
https://www.nicehash.com/profitability-calculatorCheck the most popular cards, then check the prices on your local market and do the math.