Tutorial : How to create a landing page or launch page for my startup?

Hi Thibault - you should probably look at completing the front end development track as this will teach you all the html, css and javascript you will need to know in order to build a simple landing page like the examples you have suggested. Once you have these skills you can follow one of the many simple tutorials online about creating great landing pages from people like unbounce.

The animated typer plugin being used on the hello spencer website is a JQuery plugin called typer - so for this you will need to understand JQuery which is part of the front end dev track or there are many other courses on it at treehouse. Hope this helps.

Ps. you don't need to create multiple threads in every language to get a response on these forums just one will do.

At the very least, you could take the "How to Make a Website" course with Nick Pettit, and take a jQuery basics course, although jQuery will be far more difficult without a basic understanding of JavaScript, which you can also find a basic course on.