Trusted teacher: MIT App Inventor is a visual programming environment that enables everyone to build apps for smartphones and tablets. The course for beginners does not require any previous programming experience. It starts with an introduction to the App Inventor interface. Then, after Event-Driven Programming is explained, learners will discover the available command blocks which they will have to combine to make their own apps. During this course, learners will have the opportunity to use their imagination and practise analytical and critical thinking to create their own apps such as animations, games, quizzes, tourist guides or drawing apps. This course also aims to engage intermediate or even advanced App Inventor programmers who can build on their previous experience to create more sophisticated apps. The content and pace of the course is adapted to the age and needs of the learners.