find a file: find FROM_DIRECTORY -name 'FILE_NAME_OR_NAME_PATTERN'

find directories: find FROM_DIRECTORY -type d

find links: find FROM_DIRECTORY -type l

find exec: find FROM_DIRECTORY -type d -exec ls -l {} ;, here \; is escaping;for ls command and{}` is for every output of find this is input for the ls

find files that were modified in the past hour: find -mmin +60 -name 'FILE_NAME_OR_NAME_PATTERN'

find ... -iname ... : case insensitive search

-user USER: files owned by USER

-group GROUP: files owned by GROUP

-perm NNN: files has permission with NNN, here NNN is permission numbers like 666, 400, etc.

-size SIZE: files of size SIZE, e.g. +1M, 1M

-links NO_OF_LINKS: links associated with the file