Search engine optimization is one of the key ingredients in blogging, in fact to me; I called it the “behind the scene of blogging”. However, some few years ago when I started out as a novice blogger, all that was on my mind then was just create any how blog and put contents inside.

I never knew the meaning of SEO and also the important, in fact then I was limited to the number of things that I knew. Not because I wasn't smart, but because I was ignorant of them.

So also some bloggers today, you may be new in blogging, or you chose your niche outside blogging tips; like entertainments, fashion, health etc. You keep hearing about SEO but you never have the opportunity to know what it means.
http://allbloggingcoach.com/2013/10/search-engine-optimization-seo-right.html