This is what Google tells us to avoid

[jacksonp]

As an experienced person of SEO I want to share here some facts which should avoid by us.I hope that this will help some of the newcomers a lot..

choosing a title that has no relation to the content on the page
using extremely lengthy titles that are unhelpful to users
using a single title tag across all of your site’s pages or a large group of pages
stuffing unneeded keywords in your title tags
writing description meta tag that has no relation to the content on the page
Multiple domains
Multiple identical sites
Cross Linking

[Bradley123]

Hi, Good information. Thanks for sharing with us.

[Sinclair12]

It is really important information and need to know by the people who are in this field...