Solve communication problem between NRF24l01 modules and Arduino Nano

I have two Arduino Nano and two NRF24l01 modules, I have tested many tutorials, but the signal can not be transmitted from the first one to the other. I have changed the Arduino to UNO and Mega, and have used other NRF24l01 modules as well. The problem exists. I need help to transfer a one-digit number between them.