Basic understanding of SEO is crucial to success of your business.Creating a website alone is not enough to get people visiting your website.It is going to be lost in millions of other websites doing same kind of business.So how do you let search engines like google,bing know about your website ? By doing search engine optimization of the website.It is a way that we let these search engines know about our business and what type of business it is.So next time someone is searching on the internet for that type of business,your website comes up in search results.Well ! it sounds easy but it a very complex and need good understanding of how SEO works to rank on page one.
Here is a video on on basics of SEO by MOZ,one of the most reputable SEO companies.Also read this SEO book for beginners. You can download it in PDF format.