1 - https://pythonprogramming.net/server-chatroom-sockets-tutorial-python-3/
2 - https://codinginfinite.com/python-chat-application-tutorial-source-code/
3 - https://github.com/mrahulkrishna/simple-chat-room-using-python/blob/master/server.py https://www.geeksforgeeks.org/simple-chat-room-using-python/
4 - https://www.binarytides.com/code-chat-application-server-client-sockets-python/