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.