What is best way?

Of Couse, If you are proper active in a niche forum which allows do follow backlinks of high-quality traffic that turns into conversions. The Do-follow backlinks are kind of permanent backlinks. They are considered as link juice. They help you in more search appearance on many keywords.
If you want links from forums, you should maintain originality with your content, and have to wait for a limit of posting/ commenting on forums, which depends on different limit in different sites. So, be knowledgeable, and comment very informative.
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