Mac storage basics · Finder tools for finding space
How do I see exactly where a file is stored in Finder?
Short answer: Choose View → Show Path Bar in Finder to see the folder chain at the bottom of the window. Control-click a file and hold Option to copy its path as text.
Choose View → Show Path Bar in Finder. The bottom of the window then shows the chain of folders from the disk down to the current item, and you can double-click any of them to jump there.
To copy a location as text, Control-click the file, hold the Option key and choose Copy "…" as Pathname. For a file you found in a search, select it and the path bar shows where it really lives.
Knowing the folder matters before you delete anything: a big file inside an app's own folder is usually best left to that app.