Blogging is simply writing a unique article with photos, videos and podcast that is helpful to group of viewers and sharing it through certain medium that guarantee driving of traffic to your blogsite.
It is one of ways of building community of readers and friends who listen, watch or read your article,like, share and make comments on it hereby enhancing communication between the blogger and readers of the blogsite.
Now there some reliable and free blogging platforms you should know for those who are newbie in blogging.
They are:
www.wordpress.com
www.blogger.com
www.tumblr.com
www.wix.com
www.yola.com
www.medium.com
www.weebly.com
www.squarespace.com
www.ghost.com
Although the blogging choice made by people depends on what they intend to get from the blog. Personally, i would recommend blogger, wix and tumblr. You can try others and gives us your own view of it.