Neutral reference articles about system folders, commands and settings: what they are, how to check them and what is safe to change. Every command is checked against the official documentation.
System folders, repair tools and security features of Windows 10 and 11.
BitLocker recovery key · DISM (Deployment Image Servicing and Management) · Driver Store (DriverStore\FileRepository) · Microsoft Defender SmartScreen · SFC (System File Checker) · Storage Sense · Temporary files in Windows · Windows Recovery Environment (WinRE) · Windows.old folder · WinSxS folder (component store)
Logs, packages, disk space and services on Linux servers and desktops.
APT package cache (apt clean and autoclean) · cron and crontab · df (disk free) · Disk usage with du and ncdu · Finding large and old files with find · Inodes and 'No space left on device' · journalctl and the systemd journal · logrotate · Swap space on Linux · systemd units and systemctl
Storage, battery, connectivity and security settings on Android phones.
Android version and security patch level · App cache vs app data on Android · App permissions on Android · Battery Saver and Adaptive Battery · Developer options and USB debugging · Factory reset on Android · Find Hub (formerly Find My Device) · Freeing up storage on Android · Safe mode on Android · USB tethering on Android