How effective is using SEO methods in developing my site?

Key word related as your website 

like tags used :

Tittle

metadata

description.

search engine pick those site which are key word related as your sites.........

Good question, simple answer: SEO Guidelines are mostly important Webmaster/web development guidelines that not only help in SEO but, alo, in general website maintenance, development, and end user friendliness as well. they are a must.

SEO methods are must and you should implement them in good manner and code your html in semantic way.

SEO helps to rank your website on different search engines .

it will help you to get more targeted audience by using proper title, keywords and description to your html page.

Try to make url's SEO friendly. This will help search engines to rank your site by analyzing easily.

Try to use structured code and apply the semantic web rules.

SEO rules are must to follow now a days, the code must be cleaned, easy to use, and have everything that a website require.

There are number of things which needs to be done.But the most important is the code and website performance. Avoid using heavy JS, images css codes, use what you need instead of adding everything for a little functionality!

it will increase the number of your monthly audience, monthly traffic and it would attract much more

Developing website with SEO methods will result in targeted traffic to your website. The search engines will rank your website if its optimized and well managed. Your website should both User friendly as well as search engine friendly.