How to delete other file?

OK, there are various ways of seeing the sizes via open windows in ‘Finder’ Using the menus but as your looking at the ‘About this Mac>Storage we’ll deal with that So to the right of that window in the screenshot it says ‘Manage...’

Click that, it’ll take a few seconds to start calculating, and down the left hand side you’ll see folders with sizes. Look at those and if any show huge sizes that’s where to look to start. Do that and we’ll go from there. Obviously ‘Applications’ will be big, but try this first.

Where are you seeing this file called other files? Don't delete anything until you can tell us where it is located and any other info! Screenshots would possibly help and details of your storage size and the file size(S).