Web Developer Tutorials needed

Hello, I need Tutorials written on HTML5/CSS3, jQuery, Ruby on Rails, advanced PHP and everything mobile. These tutorials will be published in our newly developed wiki. We will be paying $15/1500+ words. You will paid more if you can write tutorials on more popular topics but which are not much available on the web. Payment via paypal only. PS: If you have no basic knowledge about web designing or any of the topics mentioned above, don't bother bidding. This is NOT A RESEARCH PROJECT, but you need to be a real programmer/developer to be a part of this. You will need to attach a similar tutorial which you had written earlier, we will use it to assess your skills. Bids without samples will not be considered.