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1: https://stackoverflow.com/questions/68051372/how-to-execute-poll-function-right-away-in-telegram-bot-python-code
2: https://towardsdatascience.com/bring-your-telegram-chatbot-to-the-next-level-c771ec7d31e4
3: https://github.com/python-telegram-bot/python-telegram-bot/blob/master/examples/pollbot.py
4: https://python-telegram-bot.readthedocs.io/en/v13.3/telegram.ext.callbackcontext.html
5: https://python-telegram-bot.readthedocs.io/en/stable/telegram.ext.chatmemberhandler.html
6: https://readthedocs.org/projects/python-telegram-bot/downloads/pdf/latest/
7: https://www.section.io/engineering-education/building-an-appointment-scheduling-telegram-bot/
8: https://www.scribd.com/document/445779921/python-telegram-bot