Who can guide me about guest posting?

This question is pretty vague.

Guest posting can be useful in some situations.

Guest posting just to get a link is no of value and should be avoided.

Paying to have guest posts to get a link is also not valuable and should be avoided.

There are many many people selling services to offer guest posts.

This is clearly a violation of search engines terms of service and while it may provide some short term gain it is a good way to get a penalty in the long run.

Also - there really isn't an optimum number of words. You can benchmark against the competition of your target keyword. It is more important to match search and SERP intent than hit an "optimum" number of words.

When I guest post for someone else, I do the following:

• Link to the post from my blog
• Promote it on Twitter (several times)
• Share it on Facebook
• Thank the person
• Stick around and respond to comments on the post

While not everyone does this, it’s not a bad idea. However, this is important: If you have to choose between getting people to guest post on your site or guest posting elsewhere, do the latter. It’s always better to get your name out into new communities.

I also need this info.

Expend your money for writing good piece of appealing content and publish it on your site that will be more worthy for your site. 

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Guest posting just to get a link is no of value and should be avoided.

If you’re in the market for targeted traffic and powerful backlinks, guest posting should be at the forefront of your mind. And while Google has publicly warned against mass, low-quality guest posting, there’s no doubt that it’ll remain a link building bedrock for years to come. In this chapter you’ll learn how to get the most from this timeless link building strategy.