The ninth SEO mistake to avoid might seem like common sense, but surprisingly is a common problem:

Not putting contact information on the site

Occurs when

Your company phone number or other contact information doesn’t appear in the banner of your site which would make it very easy for people to contact you.

Fix by

It can be fixed by putting the phone number big and bold in the banner. Make sure you put it in the footer and other obvious places like the contact us page.