How to learn English Grammar

Hey guys
I make a lot of grammatical mistakes in my sentences. I have written 2 articles
http://ezinearticles.com/?All-About-Page-Rank&id=5609174

http://ezinearticles.com/?Facebook?-Yes-Facebook-For-Social-Media-Marketing&id=5612563

Can someone read this and give me a feedback on it. I want to become a good Article Writer

Thanks & Regards
Akshay Tatuskar
www.growpublicity.com