As i have ever mentioned before on why should you worry about suplemental result / duplicate contents, here is a trick to make your blogger save from it. All you have ever learn about SEO must know what does it means.
If you don’t have any idea yet about what is supplemental result or duplicate content, then i recomend you to read this: what is bad about supplemental result / duplicate content. or you can also read it here.
Blogger or blogspot blog has a really-really bad structure for SEO. that is because blogger shows all post content on the index page and also on the categories page. that makes the categories page duplicate with the post page. that’s why you need to tell search engine to not indexing the categories page.
so here is the trick.
If you host your blog/site on your own hosting, you can use robots.txt file to tell search engine to not indexing our duplicate content, but unfortunately, we can’t use that file for blogger/blogspot blog.
So we will use meta tags for it. here is the steps.
1. Go to your HTML Editor for your blog on blogger dashboard.
2. Find this line of code;
<head>
3. then copy this code below, and paste them right after the code above;
<b:if cond='data:blog.pageType == "archive"'><meta content='noindex,follow' name='robots'/></b:if><b:if cond='data:blog.pageType == "index"'><b:if cond='data:blog.url != data:blog.homepageUrl'><meta content='noindex,follow' name='robots'/></b:if></b:if>
so it will looks like this below;
<head><b:if cond='data:blog.pageType == "archive"'><meta content='noindex,follow' name='robots'/></b:if><b:if cond='data:blog.pageType == "index"'><b:if cond='data:blog.url != data:blog.homepageUrl'><meta content='noindex,follow' name='robots'/></b:if></b:if>
4. save your template
5. refresh your blog and done.
to see if you did it or not, just view the html source code of your categories page on your site, if you see this line, then it means you did it. if not, please try again all the steps above.
just please remember to always backup your templates first before make any changing or modifying.
Note:
If you want to let search engine don’t index your main page, you can also modify the code on step #3 above to become like this
<b:if cond='data:blog.pageType == "archive"'><meta content='noindex,follow' name='robots'/></b:if><b:if cond='data:blog.pageType == "index"'><meta content='noindex,follow' name='robots'/></b:if>
so it will become like this;
<head><b:if cond='data:blog.pageType == "archive"'><meta content='noindex,follow' name='robots'/></b:if><b:if cond='data:blog.pageType == "index"'><b:if cond='data:blog.url != data:blog.homepageUrl'><meta content='noindex,follow' name='robots'/></b:if></b:if>



mr Jack thanks for the hack, and i have more question, how to make our blogger feed and archive are not indexed by google and other search engines?
How if our archive page, not index by search engine
jack, please publish again the “related posts” article, i can’t find it on your new site.Thank you!
jack, thanks for this tip.
i find it was useful for us as blogspot blogger…