Here is a checklist for clean SEO :
Unique content
- Update content
- Keywords in <title> tag
- Keywords in URL
- Images in the <alt> tag
- Keyword density in document text
- Anchor text of inbound links
- Backlinks from similar sites
- Backlinks from .edu and .gov sites
- Get links from different IPs
- Sitemap

quality content, quality backlinks which are 2 main factors to help your SEO safety, have their own strategy, it is best to be careful with link because only one small mistakes, you will pay the price for all plow hoes time there =)

dear, seo doesn't have any relation with adsense. only thing you need to do is to publish fresh and quality content to your website.

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First you have to consider two factors for safe adsense i.e., Fresh content and quality backlinks.