How can someone contribute to Wikipedia?

How can someone contribute to Wikipedia?
http://en.wikipedia.org/wiki/Help:Contents

How others can contribute?
http://www.dnaindia.com/blogs/post_how-marketers-and-pr-professionals-can-contribute-to-wikipedia_1812805

Anyone can Edit the articles, with solid refernces:
http://en.wikipedia.org/wiki/Wikipedia:Introduction

Contacting Wikipedia:
http://en.wikipedia.org/wiki/Wikipedia:Contact_us

Donate:
https://donate.wikimedia.org/w/index.php?title=Special:FundraiserLandingPage&country=IN&uselang=en&utm_medium=sidebar&utm_source=donate&utm_campaign=C13_en.wikipedia.org

Few in India are suggesting the Cheque payment to Wikipedia as they don't trust online credit card or debit card payment being too old to do that and they are not techno savvy.

ALL THE BEST TO WIKIPEDIA.

coming more.
Dr. Ashish Manohar Urkude,
ashish.urkude@gmail.com