The purpose of this beginner's course is to inform, sensitize, and encourage mobilization around these SDGs. First of all, it offers a general overview of the state of humanity and the planet in 2019, a situation that allows us to understand the idea and reaffirm the need for SDGs. It then presents these objectives, their targets and their monitoring indicators, while showing that they are interconnected. Finally, a study of what can be done concretely is proposed. The role of public, economic, media and associative stakeholders is thus examined, as well as the equally important role of citizens and youth.