Any testing traning server for tryton beginners?
Do you mean https://demo.tryton.org/?
Can we edit this . I mean can we add wizards and other modules ?
Modules on the demo can be activated from Administration > Modules > Modules with the “Mark for activation” button and from the action menu perform pending activations.
To add wizards you need to create a custom module that can extend a current model or not.
The demo server is wiped out every night so you can test things only for a day.