https://www.youtube.com/watch?v=YBJ5d3RY4_k&t=511s
Registrar
https://www.youtube.com/watch?v=Pp8vDgp2L7Y&t=159s
https://www.youtube.com/watch?v=ZcNBg7CfY10
https://www.youtube.com/watch?v=VWMP-4rT-Nc&t=650s
https://www.youtube.com/watch?v=ZcNBg7CfY10&t=362s
