If you're just starting out with the library, we recommend following our `"Your first Bot" <https://github.com/python-telegram-bot/python-telegram-bot/wiki/Extensions-%E2%80%93-Your-first-Bot>`_ tutorial that you can find on our `wiki <https://github.com/python-telegram-bot/python-telegram-bot/wiki>`_.
On our wiki you will also find guides like how to use handlers, webhooks, emoji, proxies and much more.
A great way to learn is by looking at examples. Ours can be found in our `examples folder on Github <https://github.com/python-telegram-bot/python-telegram-bot/tree/master/examples>`_.
Apart from the `telegram.ext` package the objects should reflect the types defined in the `official Telegram Bot API documentation <https://core.telegram.org/bots/api>`_.