Securing a web application requires a defense-in-depth strategy combining secure coding, network security, and continuous monitoring:
Flooding a network or server with traffic to make it unavailable to users. Web Attacks and Countermeasures
Injecting malicious scripts into benign websites to steal user data or session cookies. Web Attacks and Countermeasures
Never trust user input. Use parameterized queries to prevent SQLi and encode output to stop XSS. Web Attacks and Countermeasures
Encrypt data in transit using Transport Layer Security (TLS) to prevent eavesdropping and man-in-the-middle attacks.
Use multi-factor authentication (MFA) and secure session management to prevent unauthorized access.