RAR files are great for saving space, but for attackers, they are perfect for hiding malicious intent. Here is why downloading this "beginner's guide" is a massive risk:
You don't need to risk your hardware to learn the trade. There are world-class, legitimate resources that are actually safe:
Security measures for handling archive files in organizations
While you're hoping for diagrams of the CIA Triad (Confidentiality, Integrity, Availability), a malicious "Architecture.rar" is often designed to break all three: Encrypts your hard drive and demands payment.
Attackers often use archives to bypass initial email or browser scans. Compressed files can hide the "Mark of the Web" attribute, which normally tells your computer a file came from the internet and needs extra caution.