You may wonder, we are writing the contents of the website for users then why it is essential to make the website optimized for search engines. Of course, it is mandatory because search is the bridge between users and the websites. So first the search engines should understand that your website has the correct contents to show upon user requests.
Here you may have one question, so how should I design and develop the website user-friendly or SEO friendly?
The answer is Simple: Both. If you make your websites SEO friendly obviously it will user-friendly.
Types of SEO
- White hat SEO
- Black hat SEO
- Grey hat SEO
- Negative SEO
SEO techniques
- Website design
- Keyword Research
- Link building
- On Page SEO
- Off Page SEO
source : https://www.quora.com/What-are-the-basics-of-SEO