Its common place to need to upload and download files to and from a remote Linux server.
To upload and download files from a remote Linux server you can use the scp (secure copy) command.
To download a file you can use:
scp username@ip-or-server-name:~/path/to/file/your/downloading /path/to/location/to/download/to
To upload a file you can use:
scp /path/to/file/your/uploading username@ip-or-server-name:/path/to/location/to/upload/to
Note: It is best practice to connect to remote servers using either a strong unique password or using an SSH key pair.
Refer to How to generate an SSH key and add to authorized_keys