Windows (File Explorer): Right-click the folder/files → Send to → Compressed (zipped) folder
Windows (PowerShell): `Compress-Archive -Path “C:pathfolder*” -DestinationPath “C:patharchive.zip”`
macOS (Finder): Select files/folder → Right-click → Compress “name”
macOS (Terminal): `zip -r archive.zip /path/to/folder`
Linux (Terminal): `zip -r archive.zip /path/to/folder`
Linux (Terminal, already inside folder): `zip -r ../archive.zip .`
Linux (If `zip` is not installed): `sudo apt-get install zip`
Create a ZIP from multiple files (Terminal/macOS/Linux): `zip archive.zip file1 file2 file3`
Add files to an existing ZIP (Terminal/macOS/Linux): `zip -r archive.zip /path/to/newfiles`
Extract a ZIP (Windows): Right-click ZIP → Extract All…
Extract a ZIP (macOS): Double-click ZIP
Extract a ZIP (Terminal/macOS/Linux): `unzip archive.zip`