Which opensource application/tool/framework is the easiest to install, learn and design a dynamic website with?
I have no clue about website stuff... but a friend told me about an open source web designing thingy called Presta Shop: http://www.prestashop.com/
What kind of website? Whats its purpose, audience, and service/product?
working on dynamic site is vague, do you mean dynamic as in animated(javascript) or dynamic as in requires databases etc. for the first (javascript) all you need is a good code editor. for the second, you will need a testing enviroment such as wamp(windows) (mamp)mac (lamp)linux which all encorperiate php, apche and mysql.
PHP is a great starter environment that scales *very* well. If you're on Windows and want to get a feel for things, you could install xampp (see www.apachefriends.org/en/xampp.html) on your local machine and get started right away. That'll give you Apache, MySQL and PHP straight from an .exe -- no config, just start experimenting. The tutorials here are a good launching point for php: http://www.w3schools.com/php/. If you want to go bigger on php, Drupal is a solid module-based content management solution that has an amazing user community and straight-forward installation and configuration guides. The learning curve can be a *little* intimidating at first, so I'd say start with basics first.
P.S. The US President's site runs PHP/Drupal...so you'd be getting good practical experience on an enterprise-level solution.
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