Hi I am working on real estate domain , my competitor geting backlink from particular Seo Forum. the rankings are good for those linked kewords. SO can i post link in Seo Forums.
Did you register at that particular Seo Forum? Did you read the entire guidelines of that Seo Forum? If you read the guidelines, you have already learned about posting link on that forum. If you still not read, just start now. You will get all answers there.
I always heard about niche and relevancy theory from experts. According to this theory, you should build links on your business relevant websites; it works good. In your case same theory will apply. It is better to post your link on real estate relevant forum sites as your link worth more on that place. Now if we talk about your competitor, there are several factors that Google considers to rank a website high from others in SERP. So i think it isn't an effective practice to give link on other niche website. However you can post your link on SEO forums under forum guidelines too.
I don't know more about it but what i know is they got strict guidelines, and majority of the good SEO forums won't allow you to post back links directly in fact you can use it in the form of signatures.
It is good to use signature only on the forums website, if you read guidelines you can understand very easy, If you have a chance to post a link in any other forums i suggest don't post your link directly. If the forums website effects with any updates, your website will effect, so take care of those forums.
Its good that you kept track on your competitor backlink and got to know that forum name, but make sure to read the guidelines of that particular forum and signature will be accepted only after certain posts.
I agree, you should consider reading the guidelines of the forums. Some forums do not allow to have links.