Change permissions Recursively
For chmod and chown you can use the -R option. With -R it is possible to change files and directories recursively. This will change the permissions of the testfolder and all files and subdirectories inside.
chmod -R 755 /testfolder
File Transfer via SSH
copy from a remote machine to my machine:
scp user@192.168.1.100:/remote_user/Desktop/file.txt /me/Desktop/file.txt
copy from my machine to a remote machine: