What are the common mistakes people making during link building? Here I found some common mistakes people do.

• The most common mistakes I have found that people concentrating on low quality links (submitting to low page rank web directories in wrong categories, buy links from bad link selling portals, articles sites etc ).
• People do link farming. Link farm also affected your site. It will spamm your website. Link building with relevant site is very important for external linking structure of your site.
• Big sized Image or banner links from adult sites or irrelevant sites.
• Linking on too long lines and text.
• Linking on “Click Here”, “About Us”, “View My Site”, “Contact Me” these kind of anchor links are not suitable.

The things you've mentioned above are true.. Most people don't care about quality links.. They say that its okay as long as your getting back links from sites that don't have any relevant topics as yours..