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When learning ethical web hacking, should I learn javascript, html, or both

Understanding HTML and being able to manipulate it to your advantage will be important, as well as being able to interpret what some javascript code is doing. I recommend looking into both as they will both aid you.Having an understanding of things such as input validation can lead into being able to perform SQL injection attacks; you should definitely look into SQL injection, as well as command injection, but ensure you are comfortable manipulating HTML and understanding javascript before moving on to this. Grasping these concepts will not only allow you to exploit these vulnerabilities, but also allow you to ensure you have protected any software you write against them.