Forum posting- It is the online platform where we can discuss the given topic, share our knowledge and feedback, In that we can mention our website so it helps to get backlinks. A backlink is nothing but the incoming link from another website. Many people come to forum sites to learn new technologies.
Blog Posting- -A blog is an online journal or informational website which published on the internet. A blog is an online platform where a writer or group of writers share their views on a particular subject. In short, a blog is a type of website that focuses mainly on written content which called a blog.
Blog posting and forum posting both are effective techniques to get backlinks organically. both techniques help to get a higher ranking. But many forum sites have No-Follow links that will not help to get a higher ranking.