Welcome to the Q&A Forum

So the best solution would be:

noindex,follow
and allow it in robots.txt!

Am i right?

And is it okay that my Wordpress SEO plugin puts rel=canonical on tag pages?
See example:
http://richclubgirl.com/tag/rich-fashion-2/

About half of tags are actually one-post tags!

So what could be the best practice? To no-index tag pages? Some of the tag pages have good page authority and they are linked well (with internal links). Cleaning up tags would be a very tough task, i suppose!

Or may be i should no-index only one-post tags?

I have duplicate content issue on my site, because i allow to index tags in my wordpress. And the content overlaps on them. What could be a solution to this?

How do i fight it, if still want my tag pages to be indexed in Google, but i don't want to to influence my traffic negatively?

Currently i have 596 tags!

Site:
richclubgirl.com

My idea was to put canonical tag for the post i want to rank from the most popular tag pages (with biggest page authority).

Would love to hear from You!