This is a list of free resources for those who are looking to get into information security and penetration testing but don't know where to start. This list is subject to change/updates over time.
Computing, Windows, Linux:
A+ 1101 videos from Professor Messer
A+ 1102 videos from Professor Messer
Linux Journey
Networking:
Network+ videos from Professor Messer
Basic Security:
Security+ videos from Professor Messer
Professor Messor also has a YouTube where he does live study group sessions
Scripting:
PowerShell
Bash Scripting
Python 3
Penetration Testing
Portswigger Academy
(Free but some exercises may require Burp Suite Pro, which is not free. A valid business email can request a free trial.)
IppSec - Well-explained HackTheBox solutions; blue teamer with lots of pentesting experience.
Tib3rius - Well-explained HackTheBox/TryHackMe solutions, web application pentesting mentoring; Pentester for over 8 years.
Alh4zr3d - Well-explained HTB/THM/Offsec Proving grounds solutions, maldev; Pentester and red-teamer for several years.
CyberSecurityMeg - Tips on working in security from a defensive perspective; Incident responder for several years.
CWinfosec - Interviews with career penetration testers and red-teamers; Pentester and red-teamer for several years.