Recursive change of permissions for folders and subfolders under Linux

We use chmod command to change permissions of folders and files.

[email protected]:~# chmod --help
 Usage: chmod [OPTION]… MODE[,MODE]… FILE…
   or:  chmod [OPTION]… OCTAL-MODE FILE…
   or:  chmod [OPTION]… --reference=RFILE FILE…
 Change the mode of each FILE to MODE.
 With --reference, change the mode of each FILE to that of RFILE.
 -c, --changes          like verbose but report only when a change is made
   -f, --silent, --quiet  suppress most error messages
   -v, --verbose          output a diagnostic for every file processed
       --no-preserve-root  do not treat '/' specially (the default)
       --preserve-root    fail to operate recursively on '/'
       --reference=RFILE  use RFILE's mode instead of MODE values
   -R, --recursive        change files and directories recursively
       --help     display this help and exit
       --version  output version information and exit

For example:

chmod -R 777 /home/rockfuns