Network security
Firewalls · IDS/IPS · Wireshark
Web app security
OWASP Top 10 · Burp Suite
Penetration testing
Kali Linux · Metasploit · Nmap
Defensive security (SOC)
SIEM · log analysis · incident response
Cryptography
TLS · PKI · hashing · encryption
Cloud security
AWS/Azure IAM · misconfigs · CSPM