Some of the SEO mistakes are
 

Some of the common SEO mistakes are as follows
use of duplicate content
create the bad backlinks
not update the new keywords
Use the wrong keywords for backlinks.

Hey can anyone explain what is keyword shuffling?

Most common SEO mistakes are that should be avoided :
1. Keyword Stuffing
2. Content Quality
3. Spammy Backlinks
4. Duplicate Backlinks

The most common SEO mistakes :
Keyword stuffing
Broken links
Copied copy
Duplicate content
Avoiding analytics

Visit for SEO Mistakes


Not Using Analytics to See What Converts
Not Optimizing for Local Search
Not Optimizing for the Right Keywords
Not Having Unique Title Tags and Meta Descriptions
Not Using Anchor Text for Internal Links
Using the Same Anchor Text for Every Link
Focusing on Link Quantity Over Link Quality
Using Poorly Written Content
Not Creating Link Worthy Content
Not Taking Advantage of Great Design for Links

The most common SEO problems are broken links, copied content, low quality contents, not good meta titles and description.