I have compiled a list of Red Team/Blue Team CTF Platforms to test your skills on. I have to say that they’re not in order but if you wanna start with any of them then I would Highly Recommend OverTheWire followed by THM and then HTB.
- Attack-Defense
- steike's CTFs
- CTF Komodo
- CryptoHack
- CMD Challenge
- Explotation Education
- Google CTF
- HackTheBox
- Hackthis
- Hacksplaining
- Hacker101
- HackerSec
- Hacking-Lab
- HSTRIKE
- ImmersiveLabs
- NewbieContest
- OverTheWire
- Practical Pentest Labs
- Pentestlab
- Hackaflag BR
- Penetration Testing Practice Lab
- PentestIT LAB
- PicoCTF
- PWNABLE
- Root-Me
- Root in Jail
- SANS Challenger
- SmashTheStack
- The Cryptopals
- TryHackMe
- Vulnhub
- W3Challs
- WeChall
- Zenk-Security
- Cyber Defenders
- LetsDefend
- Vulnmachines
- Menzil Kuvveti
- Ctftime
- Pwn koleji
- Attack-Defense
- Alert to win
- CTF Komodo Security
- CMD Challenge
- Hacker Security
- Defend the Web
- PwnLab