When compressing very large folders, select "Best" compression using the "Compression method" drop-down menu. Although WinRAR will take longer to compress your files, the resulting ZIP file will ...

Both ZIP and RAR use different compression techniques, and RAR has the added benefit of dividing a single file into several pieces.

Occasionally, you'll need to open several compressed files from one ZIP folder. While Windows does a fine job extracting, there are better tools to unzip.