how to find large files

I just open Finder and sort by file size for different folders/drives.

Most are in the folders for audio-visual files.

some tips and suggested free utilities for IDENTIFYING (NO auto-delete, that part is at your discretion) discussed in this article:

What is “Other” storage on a Mac, and how… - Apple Community

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Many folks will recommend this utility (Find Any File - FAF) to aid in file location and selection:

https://apps.tempel.org/FindAnyFile/