There are total 18 types of backlinks, out of which only 4 backlinks we can use for better SEO. The Four types of BACKLINKS that your website should have for better SEO are as follows:
1. The informational backlink
2. The definitional backlink
3. The referential backlink
4. The promotional backlink
The rest of backlinks like Link exchanges, Low quality backlinks, Backlinks from websites with duplicate and spinned content etc should not be used for website because it VIOLATES GOOGLE'S GUIDELINES.