Programming
Python C++ Rust HTML / CSS Swift
Offensive Security
Web exploitation Privilege escalation Active Directory attacks OSINT Cryptography Forensics Pwn
Defensive
HTB Sherlocks Log analysis Malware analysis
Blue team awareness makes you a better attacker.
For Fun
CTF / Hacking competitions Working on personal projects e.g. small games, personal use case applications, efficient programs Scripting (often with PowerShell) Testing/researching CVEs Bug bounty programs