How to make create a blog?

Answer 1

A 'blog' means a web site wich provide some specific interractivity features:

(1) an interface to publish article without writting Html pages (but just writing content, wich will be dynamically included in a template
(2) an user authentification system (to allow only specific users authoring the blog
(3) a comment system, allowing visitors and/or registered users to post comments

You can also make a simple static web site, without all that interractivity stuff, but this will be called web site/page and not really 'blog'... This could require only some Html/Css, while writting a blog system from scratch will require at least server sided stuff and database handling. Anyway, there are plenty of ready made CMS (content management system) as WordPress that you can install and use, or even use directly without installing anything, through hosted account (for charge and/or for free) ;)