How to display a welcome message when a user joins a chat or group, Aiogram BOT?

Question

Bots

I want to display a welcome message when a user joins a chat group, but I don't know how to do it. Bot on Aiogram, Python. Help me please.

Answer 1

@dp.message_handler(CommandStart())
async def bot_start(message: types.Message):
    await message.answer(f"Привет, {message.from_user.full_name}!\n"