How do I delete "other" on mac catalina? it is taking 50GB...

Just to provide you with some alternative views (I'm not necessarily disagreeing with Ronasara), please take a look at these articles:

• What is "Other" storage on a Mac, and how can I clean it out? - neuroanatomist ASC
• What is "Other" and What Can I Do About It? - Kappy ASC
• What is Other on Mac Storage and How to Clean It - iGeeksBlog

The Other Category can not be altered, modified, move or deleted since it is part of the Mac’s operating system. Doing so would corrupt the OS and render the OS inoperative requiring a Wipe and Re-Installation.

The Other category is a potpourri of files which include:

• System temporary files

• macOS system folders

• Archives and disk images (.zip, .iso, etc. - often found in the Downloads folder)

• Personal user data

• Files from the user’s library (Application Support, iCloud files, screensavers, etc.)

• Cache files

• Fonts, plugins, extensions

• Other files that are not recognized by a Spotlight search

• Media files that cannot be classified by Spotlight as a media file because they are located inside of a package

They can be located anywhere on your hard drive. The files that you have control over are located in the Documents, Downloads, Pictures, Music and Movies folders.

Also, if your OS becomes too full your computer will stop functioning. This may be a good time to seriously consider adding an external drive for storage. Then you can move files onto it and then delete them from your HD to clear needed space. Easy to do and problem solved.