Which keyword density % you prefer for your main (most important) keyword?

The keyword density should be around3-4%.

Just try to make things naturals. Add relative content to the keywords.

During my optimization I follow the following guidelines.

- Keyword in Title.

- Keyword in H1.

- Keyword in first Paragraph

- Keyword in Alt Tag.

- Keyword in Sub Headings.

The content should be for humans, not for Google.

Add good, relative, and unique content to your website.

Make variations keep on blogging. And follow all the guidelines which are provided by the search engines.

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but i will keep it moderate and keywords should make sense instead for focusing just density.