Follow and no follow attributes

hello to all
My question is
Is there any benefit to do posting on forum websites or blogs which have nofollow attributes?
And other Question Is robots meta tag in wrong spell in on page seo will effect the seo?

Nofollow links do not contribute to SEO or search engine rankings, if that is what you mean.

However, if you start contributing regularly to an online community, folks tend to check out your signature and profile and might visit links that appear in those places if what you say holds some value.

And other Question Is robots meta tag in wrong spell in on page seo will effect the seo?

Can you rephrase that question? I’m not sure what you’re asking.

if we use the wrong spelling in robots meta tag i.e. <meta name=“robot” content=“index,follow” />
this meta tag useful or not

Computers are not people. If you spell a word wrong, and it’s part of the code, they will usually ignore it. If you put ‘nofolow’, to a computer that means nothing at all.

Is it true or not Yahoo follows nofollows links?

It looks like both Bing and Yahoo also respect nofollow.

Any relevant link whether it is follow or no-follow carries value. Keep things relevant and balanced though.

In respect to your other question, there are really no secret hacks that you can do in your code to help things up.
As a quick advice, make sure to add rich snippets around.

Hope that helps!