When I was learning Odoo, I found it helpful to start with a demo database and follow a complete workflow from sales order to delivery and invoicing. Seeing how the different modules connect made everything much easier to understand than studying them one by one.

1. Odoo Documentation: https://www.odoo.com/documentation/19.0/

2.Blogs: https://www.cybrosys.com/blog/

3. Videos: https://www.youtube.com/@cybrosys-technologies

You can also use this site for the handout https://www.cybrosys.com/odoo/odoo-books/odoo-16-studio/define-compute-method/

Use tutorial from odoo site https://www.odoo.com/slides/tag/odoo-tutorials-9