François Truffaut, 1959. Antoine Doinel's wandering Paris boyhood. The most-influential debut of the New Wave.
From Wikipedia
The 400 Blows is a 1959 French coming-of-age drama film, and the directorial debut of François Truffaut, who also co-wrote the film. Shot in the anamorphic format DyaliScope, the film stars Jean-Pierre Léaud, Albert Rémy, and Claire Maurier. One of the defining films of the French New Wave, it displays many of the characteristic traits of the movement. Written by Truffaut and Marcel Moussy, the film is about Antoine Doinel, a misunderstood adolescent in Paris, who struggles with his parents and teachers due to his rebellious behavior. It was filmed on location, in Paris and Honfleur.