a couple different thought threads...
http
ports
protocols
programming
data structures and persistence
browsers/CLIs
TCP and packets
TBD
linux
docker
burp suite
TBD
OWASP Juice Shop - https://owasp.org/www-project-juice-shop/
- installation: https://hub.docker.com/r/bkimminich/juice-shop
DVWA - Damn Vulnerable Web App - http://www.dvwa.co.uk/
- use this docker image: https://hub.docker.com/r/vulnerables/web-dvwa
bWapp - (Buggy Web App) - http://www.itsecgames.com/
- use this docker image: https://hub.docker.com/r/feltsecure/owasp-bwapp/
nMap's scanme - test nMap on this - http://scanme.nmap.org
Altoro Mutual - http://www.altoromutual.com:8080/
Fuzzgoat - written in C - https://github.com/fuzzstati0n/fuzzgoat