How to access share folder over internet

Hi, i m trying to access shared folder from home to office, can someone tell me how to do that?

I already can access shared folder in same network, but i dunno how to do it remotely.

can someone tell me what ip address i should type from home to access one of my office computer's shared folder among 3 computers?

Thankyou :)

Hi, i have a question here,

1. I have set up a shared folder in my office computer (Ubuntu).
2. I want to access to the shared folder from my home pc (windows). How?

Note: I have been able to access the shared folder by 192.168.1.6 from
another pc (windows) in the office, with Samba installed on the
Ubuntu.

Thank you.