
Cyber security has become a necessity for businesses of all sizes as their systems and networks containing sensitive and valuable data, have come under siege by malicious actors. It is designed to protect all categories of data from theft and damage.
If you are thinking about starting a business in this lucrative industry here are a few platforms that are either completely free or have free versions to help you get started in the business of cybersecurity:
(1) Cybrary
https://www.cybrary.it/?utm_sour...
(2) Root-Me
(3) Vulnmachines
(4) Hack The Box
(5) TryHackMe
(6) OverTheWire.org
https://overthewire.org/wargames/
(7) Kali Linux Tutorials
From a cloud-security perspective, Hack The Box and TryHackMe offer the most up-to-date scenarios, especially around AD, containers, and lateral movement.
OverTheWire is fantastic for fundamentals, but doesn’t reflect the complexity of modern distributed systems.
Cybrary has strong theory modules, though the labs can feel shallow compared to hands-on ranges like Vulnmachines.
For IR teams, I usually recommend pairing TryHackMe for structured learning with a self-hosted Kali environment for real tooling practice. That combination maps closest to what analysts actually handle during breaches.
Solid list for anyone exploring cybersecurity foundations. Once you're ready to transition from learning to implementation, platforms like Hoplon InfoSec can support with real-world assessments and enterprise-grade solutions. Great post, Debajit!
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