CTF Platforms
- CTFtime - CTF competition calendar and rankings
- PicoCTF - Beginner-friendly CTF challenges
- Hack The Box - Hands-on cybersecurity labs
- TryHackMe - Interactive cybersecurity training
My Teams
- 0xfun - International CTF team
- Blind_Virus - National CTF team
CTF Writeups
- BUP Intra CTF Writeups - OSINT & General Challenges
- BUP Intra CTF Writeups - Forensics Challenges
- BUP Intra CTF Writeups - Cryptography Challenges
Learning Resources
- CryptoHack - Cryptography challenges and learning
- OverTheWire Wargames - Security wargames
- Web Security Academy - Web security labs by PortSwigger
- LiveOverflow - Binary exploitation tutorials