Hallo!
I'm a programmer and I was looking for a long time for a CMS to learn and to understand the code deeply.
Now I choose Xoops!
I like to contribute to XOOPS comunity and to start to develop modules.
I see the code of XOOPS and it is not very hard to understand but it take a long time to understand all "Xoops framework" at once and alone
So I ask help:
1)where can I find tutorial, manual,... for understanding XOOPS Database structure?
2)where can I find tutorial, manual,... for understanding XOOPS code structure
3) tutorial, manual,... for understanding how to built a module?
4) tutorial, manual,... for tarting to contribute to dev comunity of Xoops?

Thank you in advance for the time you spend for answering me.
Onir.

Welcome Onir to Xoops!

Unfortunately we currently don't have much doc for dev tutorial except the dev wiki: http://dev.xoops.org/modules/phpwiki/
as well as some inline docs on http://devteam.xoops.org/

Fortunately the questions you asked above are planned in the dev.xoops.org re-building.

My personal suggestion for you at this moment:
1 check/read XOOPS code from http://svn.sourceforge.net/xoops
2 register to dev.xoops.org and start a new project or join an existing project you find interesting