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docs2/dispatcher/class_based_handlers/base.rst

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+.. _cbh-base-handler:
+
+===========
+BaseHandler
+===========
+
+Base handler is generic abstract class and should be used in all other class-based handlers.
+
+Import: :code:`from aiogram.hanler import BaseHandler`
+
+By default you will need to override only method :code:`async def handle(self) -> Any: ...`
+
+This class is also have an default initializer and you don't need to change it.
+Initializer accepts current event and all contextual data and which
+can be accessed from the handler through attributes: :code:`event: TelegramEvent` and :code:`data: Dict[Any, str]`
+
+If instance of the bot is specified in context data or current context it can be accessed through *bot* class attribute.
+
+Example
+=======
+
+.. code-block:: python
+
+    class MyHandler(BaseHandler[Message]):
+        async def handle(self) -> Any:
+             await self.event.answer("Hello!")