Telegram documentation

- https://core.telegram.org/bots/api

- https://core.telegram.org/bots

Examples from python-telegram-bot

- https://github.com/python-telegram-bot/python-telegram-bot/blob/master/examples/echobot.py

Other

- https://djangostars.com/blog/how-to-create-and-deploy-a-telegram-bot

- https://www.freecodecamp.org/news/learn-to-build-your-first-bot-in-telegram-with-python-4c99526765e4