OutSystems Learning Resources
The Phone-book app video tutorials - Start from here if you are totally new to this platform.
After you complete Phone Book app tutorial, you need to work on a small application on your own. Develop a To-Do App for Task management. The problem statement with requirements is here. You can also submit the application developed.
Development Fundamentals - These are video tutorials with more deeper dive into all the technical aspects. Things like Customizing the CSS, charts\/reports, Ajax, user roles etc. are here
Advanced Topics - More advanced topics. Probably no need to dive into this immediately.
Instructor-Led Training class - This is an online class - for two weeks. It is instructor led. You can complete the course within those two weeks. There is no fixed time for taking those classes - you can complete at your own timing and flexibility. But, it has to be done in two weeks. You have to sign up for it.