Question and answer sites is good source to build back link to your websites or blog.There are many free question and answer websites from which you can easily get answer for your question like Quora , Ask.fm. So if you get back link from this websites your ranking will improve in google and yahoo and some another search engines and its will also boost traffic on your websites or blog for free.

How to get back link from question and answer sites

Suppose if your are answering the question so while answering the question you need to put link of your blog or website so if any other person looking for similar question they might fond your question is useful and will visit your blog or website to find more information so by this you will get quality traffic to your blog or website.

Here you need to follow this steps in question and answer sites

Always write unique answer and don't copy from another source

Always write relevant answer so user will find its useful and visit your blog or website for more information.

Use relevant image and link while answering 

Avoid spelling mistakes and grammar mistake in question and answer sites

Don't include Spammy Link 

Click on Link to Know More : Free High DA Question and Answer Sites List