This document discusses several technical tips in Odoo including: 1. How to make menus visible to specific user groups by defining the menu with a "groups" attribute. 2. How to make fields only visible in debug mode by adding "groups=”base.group_no_one”". 3. How to access the current user and database name in XML code. 4. How to send emails from Python code by accessing the mail object and setting the subject, body, from and to attributes. 5. How to override existing functions without affecting the original by defining a new function with the same name.