Best means to drive website traffic

I have ready many forums and blogs on driving website traffic. Everyone says get back-links from good authority websites, I want to know its definition what is good authority website? which is good or best means to drive traffic is it forums, communities, guest blogging or any thing else that drives traffic to my website?

I have read that social media also helps in driving traffic. How a new website can drive traffic from social media. Can I drive traffic if I have no or less friends,...

Best means to drive website traffic

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