How to reduce "other" space on my iMac?

What is “Other” storage on a Mac, and how can I clean it out?

Free up storage space on your Mac

OmniDiskSweeper Safe to use

How to delete Time Machine snapshots on your Mac

See used and available storage space on your Mac

The final word from Apple on Managing the " Other " Category

• Other: Contains files that don’t fall into the categories listed here. This category primarily includes files and data used by the system, such as log files, caches, VM files, and other runtime system resources. Also included are temporary files, fonts, app support files, and plug-ins. You can't manage the contents of this category. The contents are managed by macOS, and the category varies in size depending on the current state of your Mac.

First you need learn what "Other" means, please refer to About Other storage in About this Mac

When you put something in the Trash it is the same as at home. The trash is still in the computer occupying space. It is not until you empty the Trash that you will regain space. Emptying the Trash is something users shoudl be doing periodically. I tend to do mine a couple of times a month.

Remember if you are using Time Machine to backup, even if you empty the Trash you can always restore the data if you find out later you made a mistake by deleting something.