Platzi is an online learning platform focused on offering IT courses, based on an annual subscription. In the different paths designed by Platzi, there is one about information security, and specifically two of interest for bug bounty hunters: one of them is called Introducción a la seguridad informática, which describes the basics of information security, and some of the tools and techniques used in network security assessments, and the second called Curso de análisis de vulnerabilidades Web con OWASP, which describes the different vulnerabilities included in the OWASP testing guide, with examples.

You can find these courses at https://platzi.com/cursos/seguridad/.