I am a newbie in Symfony2 and Php and I want to install Sonata project.
In all tutorial I've found I do understand that I need to update the Composer.json, the kernel, the config ,etc.
When once they talk about running a command like for example: "php composer.phar update" I have no idea where to do that I have no idea where this command is and where I should write that!
You have to install php to your server or machine. Because it is required to use php console line interface. After installation you have to install composer.phar from http://getcomposer.org/ then you can call that command which you mention. There is also some useful information about composer on that site which I refer.