Concepts such as performance, accessibility, or security are extremely important in modern web applications, however because of the running deadlines they are sometimes handled after the project is deployed to production. To deliver performant, accessible, and secure applications these areas should be addressed from the very beginning of the project development. In this talk, I will dive deeper into the concept of Security in web applications, introduce you to one of my favorite projects - OWASP, present examples of attacks and breaches, and finally share some tips and hints on how to make your project more secure. Stay tuned!