Training and certification consist of short videos and quizzes, all held within the app! Once you've received credit for a course, you become eligible to carry out missions for that specific brand, mission type, or at that particular level.
Watching videos and completing quizzes can be done at any time! If a mission is claimed and the certification has not been completed for it, you will be prompted to do so before being able to start the mission. Watching videos and completing quizzes does not "open" more missions, as all available missions are visible to users!