Odoo is built to be extended, and that is both its strength and its most common source of pain. Studio and configuration handle a great deal without code. Beyond that line sit custom modules, written in Python and XML, that can make Odoo do almost anything. The danger is what happens at the next annual release: careless customizations that overrode core behaviour break on upgrade, and the business is stuck on an old version, unsupported, afraid to move. The craft is building extensions that add exactly what you need while staying clean enough to carry forward. We build to Odoo’s conventions, so customization and upgradability are not a trade-off.