I have seen that Odoo is free for the first user. After that, it seems like you have to pay for it. Is this correct? I just want to make sure I am not missing anything.
No, Odoo is not 100% free. It is a paid software with a free community edition. The community edition is licensed under LGPLv3, which is a free software license, but it does not include all the features of the paid edition.
No, Odoo is not 100% free. It is a free and open source software, but you will need to pay for subscriptions for some of the modules.