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Odoo Developer
(programming.dev)
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Your friend could walk you through their business processes and how they plan to use the third-party software. It would be a good chance to document all that knowledge.
You could also take a look on the documentation of Odoo.
@LogicRaven @ManeraKai
I haven't had first hand experience with odoo. But their GitHub repository would also be a good place to start.
They have a tutorial : https://github.com/odoo/tutorials