I want to create a communication between arduino nano using nano expansion shield and arduino uno and I don't know if 5v pins must be connected between the arduino boards if they will be powered separately or is it correct how I connected the 2 boards
Power them separately. Neither board is designed to be a power supply for another Arduino
Connect their GND pins together to provide a common point of reference for input levels.
Connect a Tx pin on one board to an Rx pin on the other and vice versa. You would be well advised not to use pins 0 and 1 on either board because that Serial interface is used to upload code and by the Serial monitor.
Consider using SoftwareSerial on both boards on other pins of your choice. Examples in the IDE
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