Here is the list of free courses that I’ve found. It’s not a static list, so come back and check it out often. I’ll keep updating whenever I come across free courses.
RangeForce Cybersecurity Training
INE Starter Pass
Docker For The Absolute Beginner
Juniper Networks Open Learning
The Complete IP Subnetting Course: Beginner to Advanced!
TCP/IP and OSI models explained
Cybersecurity training by CyberTraining365
Hands-on lab (networking)
Intro to DFIR: The Divide and Conquer Process
SANS Cyber Aces