find is LINUX/UNIX command to find files in file system.

Here you will find few tricks:

find ~ -type f mtime 0

Will show all files in your home folder created today.

find ~ -type f mtime 0 -iname '*.mp3'

Will narrow the search to .mp3 files only and iname is not case sensitive.

And if you want to search for files that are not belonging to you use:

find ~ ! -user ${USER}

Lot more options you can find in find man page

man find