I’m really in love with MindMaps. I can recommend you the book Mind Map Mastery by Tony Buzan.
Here I have a collection of some MindMaps I’ve created:
IT related
DevOps
DevOps the three Ways from the DevOps Handbook
PowerShell
PowerShellModules from the book Building Powershell Modules - Brandon Olin
Powershell Classes MindMap - more infos: About_Classes
Azure
Hybrid Identity Azure AD - AD Connect - MindMap Microsoft Docs - Hybrid Identity
Active Directory
GPO MindMap Overview - nice blog concerning GPOs: GPO From zero to hero
Books
MindMap Übersicht zum Buch Atomic Habits - Die 1% Methode:
MindMap Overview - DeepWork - Carl Newport
MindMap Übersicht zum Buch Eden Culture von Johannes Hartl: