Sftp : how to connect from the outside

Thank you for the article ‘How to setup SFTP server on Ubuntu 20.04 Focal Fossa Linux’. I could setup succesfull. The only question that remains is : How to connect to this SFTP server from the outside ?
I have a laptop with Linux Mint 20.2. What to do to have contact with the SFTP server on my Ubuntu server at home ? On the laptop is Filezilla workstation installed.

Hi Kluit048,

Welcome to our forums.

Assuming you have a commercial Internet connection, you’ll need to forward a port on your router to your server’s SFTP port. If you don’t have a static public IP address, you’ll also need to use some sort of dynamic DNS solution, or otherwise know your public IP, which is most likely changing from time to time.