Copy a single file

Copy foo.txt from /path/to/source/ to /path/to/target/folder/

cp /path/to/source/foo.txt /path/to/target/folder/

Copy foo.txt from /path/to/source/ to /path/to/target/folder/ into a file called bar.txt

cp /path/to/source/foo.txt /path/to/target/folder/bar.txt