Compress-Archive -Path C:\\Documents\\* -CompressionLevel Optimal -DestinationPath C:\\Archives\\Documents.zip

This command:

• Compresses all files in C:\\Documents
• Uses Optimal compression
• Save the resulting archive in C:\\Archives\\Documents.zip
• -DestinationPath will add .zipif not present.
• -LiteralPath can be used if you require naming it without .zip.