Using SCP you can transfer files easily between one computer and another where ssh is available. This article is reference notes on how to use scp.
“Secure Copy Protocol. The SCP is a network protocol, based on the BSD RCP protocol, which supports file transfers between hosts on a network. SCP uses Secure Shell (SSH) for data transfer and uses the same mechanisms for authentication, thereby ensuring the authenticity and confidentiality of the data in transit.” Wikipedia
scp source destination
Transfer a file from the /var/www directory of the server to my home directory.
scp chris-shaw.com:/var/www/file.txt ~/file.txt
Transfer a file from my home directory to the /var/www directory of the server.
scp ~/file.txt chris-shaw.com:/var/www/file.txt
When transferring large files or lots of files, look into using compressions with tar.gz, see https://www.chris-shaw.com/blog/compressing-a-directory-on-linux