In On-Pages Optimization we create Title, Description, keywords, Alt tags and H1 tags.

On-Page SEO Checklist:

Always start with keyword selection, research and testing
Meta Description tag
ALT tags
H1 tags
URL structure
Internal linking strategy
Content
Keyword density
Site maps, both XML and user facing
Usability and accessibility
Track target keywords
Expect results in 6-12 months

Back links are very much helpful to get Page Rank and also helpful to achieve top ranking.

To simply define SEO, I'd say it refers to the system of using online techniques and strategy for brand positioning, increase of site traffic and building online brand presence. SEO is undoubtedly a very important part of today's marketing system.

In order to acquire the implements for your requirement you have to practice lot of stores similar to these and that you must endure as well.

Backlinks help you to gain a high level of Page Rank. You can expect to attract considerable amount of traffic. On Page optimization also improves keyword positioning.