Create a tar file of files located in a folder:
tar -cvf filname.tar foldername/

where:
c = create
v = verbose
f = file

filname.tar = the created file

———-
To show the content of a tar’ed file:
tar -tvf filname.tar

———-

extract a file with tar:
tar -xvf filname.tar

where

x = extract
v = verbose
f = file