Connecting a client to a server outside of the local area, how to do it?

Question

Python

There is a task to make a client-server program in python. Communication between client and server is done using sockets. On the local network it is possible to connect, but not on the global one.
Server code:

import socket

host = socket.gethostbyname(socket.gethostname())
server = socket.socket(socket.AF_INET, socket.SOCK_STREAM,)
server.bind((host, 9090))
server.listen()
while True:
  user, addr = server.accept()
  user.send("Connected".encode('utf-8'))
  pass

Client code:

import socket

client = socket.socket(socket.AF_INET, socket.SOCK_STREAM,)

client.connect((внутренний айпишник хоста, 9090))
while True:
  data = client.recv(2048)
  print(data.decode('utf-8'))
  pass

Answer 1

Run to read about opening / forwarding ports, the differences between gray / white ip address, NAT and vpn, most likely