What is Guest-Blogging?
Guest-Blogging means authoring a post or a blog-entry at someone else’s blog without involving monetary issues. When paid for writing a post, it is then called a paid-post or a sponsored post rather than a guest post.
Here are,
7 ultimate reasons, why you should guest author at a blog:

Vent your thoughts outside your niche:
Packing [...]

Xavier Media Blog is a place where you can find posts that you need to know to be a webmaster or a blogger. Written by Andreas, this blog is a part of Xavier Media, a web company that offers PHP scripts, CGI scripts, Java scripts, e-Books and other stuff related to web development and management.
Xavier [...]

As a blogger you’re constantly having to think up new post topics. Blogging should be something you enjoy, and not a black cloud that follows you from the bedroom to the bathroom to the computer. When I wake up I’m usually excited to start a new blogging day.
By the time I’ve rubbed my eyes clear, [...]

What in the first place is noFollow?
In an attempt to minimize comment spam, the blogging platform you use automatically adds the rel=’nofollow’ attribute to the comments template.
rel=’nofollow’ attribute works by not following back the links that a commentator might post in his comments, in the Search Engines; as they can be a potential source of [...]