Since there was no section for postgre databases, I decided to post my question here.

After having transformed my files in xml (see my previous post) I would like to load them in a postgre database.

Since I used Talend Open Studio, to do the previous step, I would rather do this step with the same soft, since it seems to be capable of doing it.

First question : is it really possible ?

yes, of course it is possible since talend open studio is a comprehensive open source data integration software.

Do you need help to do it?

I am going to see if I can manage to do it myself on monday.

Can you tell me where I can find a kind of tutorial on Talend Open Studio please ?

You can find a comprehensive documentation here : Talend Open Studio - Users manual

In addition to the user manual, are there tutorials ?

Of course, you can find tutorials that explain the basics here :
Talend Open Studio - Tutorials