How to create a blog?

Answer 1

With a backend app and handling database, authentification, handle members...
And a frontend web site interract dynamically with your backend, to display and upload information into database.

Wordpress or other, tiny to big, less or more advanced frameworks exists to handle all this stuff with less or more facilities versus low access to it ^^

Answer 2

wordpress or google blogs

Answer 3

use blogger.com
or wix

Answer 4

thanks