How do I find out a file's particular size?

Good Evening,
I am looking for assistance with figuring out a file's particular size within a group of files.
If I have one large directory and I am looking to find out what the smallest file in that directory is, how would I go about doing it?
Also, how would I figure out when the file was created on the system or particular hard drive such as a network attached storage device?
Thank you!

While command + i (or the Finder Information icon) would give you the file size, that would require a one-by-one approach. Perhaps quicker would be using a utility like "What Size" that will list Folders/files and give the size of each.

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