Free cheat sheets
Genuinely useful, printable quick references, no account, no email required. The kind of thing you tape next to your monitor while you study.
Common Ports & Protocols
Printable ports and protocols cheat sheet for CompTIA Network+ and Security+, well-known port numbers, transport protocols, and secure vs insecure pairs.
Open cheat sheet →A+ Hardware Quick Reference
Printable CompTIA A+ Core 1 hardware cheat sheet, RAM types, storage interfaces, RAID levels, display connectors, and the laser printing process.
Open cheat sheet →AZ-900 Azure Services Map
Printable AZ-900 cheat sheet mapping core Azure services to their categories, compute, storage, networking, identity, and management and governance tools.
Open cheat sheet →AWS Cloud Practitioner Service Comparison
Printable AWS Certified Cloud Practitioner cheat sheet, core compute, storage, database, networking, and security services with one-line use cases.
Open cheat sheet →CCNA Subnetting Reference
Printable CCNA subnetting cheat sheet, CIDR prefixes, subnet masks, host counts, block sizes, and the fast subnetting method for the 200-301 exam.
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