This is an online training platform for everything you can imagine, from cooking recipes to information security. In the information security topics, it is possible to find some courses about network security, web application security, ethical hacking, penetration testing, and some specialized courses focused on technologies such as Splunk, Checkpoint, and Cisco.

Actually, there are bug bounty courses at https://www.udemy.com/courses/search/?src=ukw&q=bug+bounty, based on the methodologies explained in this book.

The difference between Udemy and Platzi is that Udemy offers discounts that are higher, and it is possible to just pay for one course and not a complete subscription.