Which SEO activities we should avoid?

1) Anything that Google says is bad (including, *sigh*, guest blogging)
2) Anything "spam"
3) Key-word stuffing. Even though it has the potential to be very helpful, try to keep it under 20% per post.

 

There are lots of activity you should avoid:
1. Avoid bad linking(Like FFA site)
2. Avoid Keywords Spam in content
3. Avoid Quantity linking do quality linkbuilding
and lots more do care of your webmaster a/c google is going to help you....

 

keyword stuffing, using the same anchor text in backlink campaigns, over optimization, backlinking using fiverr gigs, comment blasters, building backlinks outside of your niche unless and authority figure of that website, spam.

 

In purpose of your listing the mistakes what you should avoid in your right SEO activities, you could consider the points below:
1) Keywords that don’t represent the content
2) Lack of Sitemap Submission
3) Lack of your Old Post updates
4) Poor Site structure for SEO
5) Lack of On-Page SEO
6) Write for SEO
7) Anchor Text mistake
8) Lack of white hat SEO practice
9) Content copy-paste
10) Poor Loading Speed
11) Lack of content marketing
12) Keywordless Permalinks
13) Ignoring Mobile Friendly Site design
14) Link buying and selling
15) Hiring a laggard SEO conductor
16) Prioring PageRank, not SERP Rank
17) Quantity link instead of Quality
18) Ignoring to Start SEO
19) Thin Content Creation
20) Lack of Keywords in Title and H1 Tag
21) Ignoring Image Optimization
22) Lack of Contact Us page
23) Google dependency only
24) SEO purpose Guest Blogging
25) Lack of using Google Webmaster Tools and Google Analytics
All these issues are elaborately focused in my recently released article can search on:
'Top 25 Mistakes You Should Avoid with Right SEO Key Techniques'