How is your understanding of PHP and the WordPress codex?
JQuery, CSS, JS, also needed but I assume you know these.
That is where I would start, PHP then WordPress codex.

Genesis is a framework and you can build your own styling on top of it.

Research child themes.
Look into converting PSD to WordPress tutorials

This should get you pointed in the right direction. Always learn what is behind your ultimate goal before you make it, don't just try to learn how to make a theme, learn how a theme is made.

What use is some tutorial yet you have no idea what is behind it, you can find many free and paid themes like that online, where the designer was missing the knowledge of how WordPress even worked.

I know myself well in CSS and PHP, jQuery and JS least.
How the developers create a theme? Make it from scratch or PSD, it's right?
I thought it was a basic theme and then they changed the style.

Then focus on the WordPress Codex, since you have the "tools" down, now learn how they are used in WordPress http://codex.wordpress.org

This may help, seems to have quite a few different videos
I used this tutorial, requires dreamweaver
Editing a WordPress theme with Dreamweaver CS5


I also found a video one, didn't watch it, but it seemed comprehensive
Create a WordPress Theme with Genesis [Video]

add me on skype "shahidali788" i will give you blank wordpress theme you can learn easily
thanks.

A WordPress theme consists of a number of template files.WordPress is one of the most popular applications in the web design community not only for its ease of use as a blogging platform, but for its versatility in any kind of content managed website. Building custom themes for WordPress is pretty straight forward, making it one of the easiest templating systems to master. At the very least, a theme must contain two files for it to work.If you’re confident with your CSS and HTML, it’s not hard at all to step up to the challenge of building a custom

Thank you everyone.
@savidge4, Redux Framework, it's the same as Genesis?
I do not want to create a child theme, I want to create a theme in itself.
@shahidali788, I added you on skype.

He seems to be super Redux framework.
By cons I am always asked, the premium plugins of CodeCanyon like "revolution slider", several developers integrity in their themes, they have a special license or he buys the regular license and can use the plugin on all themes they want?
If this is the second option, it means that if I create a theme, I can integrate any premium plugin as "visual composer" or "revolution slider"?
The developer of the plugin, they lose money.