I think the most common ways and the easiest to start a blog is by using blogging platform like Blogspot or Wordpress. This is because there is basically no commitment, no payment, and both blogging platform is good and both have its own advantage. If you would like to experience or learn more about blogging, it would be a great place to start.
Blogspot
Blogspot is basically much easier to use, there is little to no extra function to what you could do with your blogpost. Despite the limited function in posting, blogspot does have more customization the its templates.
If you need any templates just search for “Blogger Templates” or “Blogspot Templates” from search engine.
Advantage of Blogspot: Minimal Function for beginners, Accept Advertisements, Many Free Blogspot Templates and Accept Own Domain (yourname.com)
Disadvantage of Blogspot: No Categorization of posting, Any third party widget needs to be install manually into the layout.
Wordpress
Wordpress is more complicated but it is a very powerful blogging platform but may be too complicated for some of the beginner blogger. There is tones of themes and widget which is ready to be added into your blog. Unlike blogspot, you will have more settings to manage post, pages, comments and widgets. 
Advantages of Wordpress: All the function needed, Categorization, Multiple Blog Author with different permission and role, Keyword Tag to provide better exposure to your site, and Built in visitor statistics.
Disadvantage of Wordpress: Fixed Theme, third party statistics are not allowed, and no advertisements.
Overall, both is very good for anyone who would like to start blogging and both is Free.
Adi, you mentioned Fixed Theme as a disadvantage for Wordpress blogs. What do you mean by Fixed Theme?
Even if you get a free WP blog hosted by WP, you still have a lot of options for your theme. So … what do you mean by Fixed Theme?
Solo Ads: I meant fixed amount of theme, compare to blogspot, the theme is basically unlimited.
The option for the theme is by the widget. Or if you choose to pay for custom css.
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I actually never visit blogger blogs. I don’t like the way their commenting works.
Tom: thanks for dropping by, that is very true…a cons of blogspot….there is a way to overcome this
http://www.riceblogger.com/blogging-tips/blogspot-with-wordpress-comment-style/
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