IT Cheat Sheets
Printable memo sheets for PowerShell, Windows, DNS, SMTP, Active Directory, FortiGate, Linux, VMware, M365 and Robocopy.
Active Directory — Essential Controls
Commands and checks for domain controllers, DNS, replication, Group Policy, time synchronization and the Active Directory secure channel.
ResourceBackup & VSS — Cheat sheet
Backup verification, VSS writers and providers, recovery objectives, backup chains and restore testing.
ResourceDNS — memo form
DNS record types, resolver checks, delegation, caching and commands for diagnosing name resolution.
ResourceFortiGate — diagnostic memo
FortiGate CLI references for system status, interfaces, routing, sessions, NAT, SD-WAN and IPsec diagnostics.
ResourceHTTP — essential codes and headers
HTTP methods, response codes, caching, redirects, TLS and headers used when diagnosing websites and APIs.
ResourceLinux — Essential commands
Linux commands for services, logs, processes, storage, networking, DNS, permissions and system diagnostics.
ResourceMicrosoft 365 — memo administration
Microsoft 365 reference for Entra sign-ins, Graph, Exchange Online, message tracing, Teams, Intune and device checks.
ResourceNetwork ports — memo form
Common TCP and UDP ports, their services and practical checks for network administration.
ResourcePowerShell — Essential commands
PowerShell commands for Windows administration, services, events, networking, files and remote sessions.
ResourceRobocopy — memo sheet
Robocopy options for file migration, permissions, restartable copies, logging, dry runs and return-code interpretation.
ResourceSMTP, SPF, DKIM & DMARC — Cheat sheet
SMTP delivery, SPF, DKIM, DMARC alignment, DNS records and email authentication troubleshooting.
ResourceVMware — operating memo
VMware vSphere and ESXi checks for virtual machines, snapshots, datastores, networking, logs and safe maintenance.
ResourceWindows network — diagnostic memo
Windows commands for IP configuration, DHCP, DNS, routes, TCP ports and network troubleshooting.
ResourceWordPress — Express troubleshooting
WordPress diagnostics for PHP logs, plugins, themes, database access, email delivery and recovery mode.