Here are some commonly used free backlink submission sites that were popular for improving SEO:
Medium: A platform for publishing articles and blog posts.
GitHub: Ideal for developers to showcase their projects and link back to their websites.
YouTube: Creating and optimizing video content with relevant links can positively impact SEO.
Reddit: Sharing valuable content within relevant communities can generate backlinks and referral traffic.
WordPress.com: A popular blogging platform where you can link
Topsubmissionsites: Free Submission Sites List Platform.