Explore a 56-minute lecture by Stefano Massai from Padua University at the Galileo Galilei Institute. Delve into advanced topics in string theory and supersymmetry, covering weakly coupled analysis, classical islands, and symmetric orbifold BPS states. Learn about circular supertubes, closed string spectrum, and 1/4 BPS vertex operators. Examine three-charge supertubes and perturbations of both 1/4 BPS and non-supersymmetric backgrounds. Gain insights into stringy BPS vertex operators and conclude with a comprehensive recap of the discussed concepts.