How can I build natural links to my website?

Recent studies also suggest that it is good to vary the text in a hyperlink leading to a page. Google spiders are pretty smart and they can frequently detect artificial link building and paid link building, which can have a negative impact on a site’s rankings. If 50 links to a web page are obtained, and every link contains the words “linking strategy”, there is a pretty good chance that the links will be flagged as artificial and their value may be discounted. As inbound links are built, think about variations of the theme for the receiving page that you can use in hyperlink text, such as “how to build links”, “obtaining links to a web page”, “good link building strategies”, “strategies for building links”, etc.
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You can use some SEO skills to achieve it.
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Build some limited back links every day.
Make sure those are relevant.

Natural links refers to a pattern of visible, prominent, naturally occurring links that are the result of website content creators trying to add value to their website.

Back links are got through other sites and these are the links that points back to your site and improve site ranking. These are called the natural links and are unique and are not copied.

Natural links are those which creates value for your website. It refers to naturally occurring links relevent for website.