Simply reading it obviously isn’t going to make your problem go away, is it?
Presumably what you mean is that you’ve read it and done things like verifying that your Rx/Tx connections are correctly inverted, that your ESP-01 is indeed configured to operate at 115200, that your ESP-01 is correctly powered that it is running the factory AT firmware.
However, as you haven’t bothered to share any of that information with us, it’s impossible to know what you have an haven’t done, why you might have overlooked etc etc.
I’m not sure what additional advice you’re hoping to obtain, other than maybe to throw your prehistoric hardware away and use a proper IoT capable board.