The primary factor would be to decide what you are going to write about or the general topics that your blog would be about. It could be based on technology , hosting , travel etc. The idea is to be original and use readable English .
Basically this is what AJAX does for your application
* Update a web page without reloading the page
* Request data from a server - after the page has loaded
* Receive data from a server - after the page has loaded
* Send data to a server - in the background
The success of any blogs depends on its visitors. So the first purpose is to drag visitors to the blog.
My list has been in the following order
1. Quality contents
2. Website performance , which includes optimized loading speed
3. Accurate meta tags
4. Seo - specific URL's
5. Each article...
There is nothing called bestVPN. Each provider has its own ifs and buts. The criteria of selection should be the closest servers to your current location. Additionally you can even setup your own VPN server using a low cost VPS