How to power an Arduino with the output pin from another Arduino

Hello all. I have researched this a little bit but I saw a few different solutions. One is use a transistor the other is a relay. What would be the best way to do that without damaging it. My code from one Arduino needs to turn on a second one for a few different reasons. Does anyone know the best way to do this or have any online examples that you know of thanks for any tips.

There are several ways to solve this issue. Can you explain what

are?

You haven't mentioned how the two devices signals are connected, or if they are. You can't just switch power alone, because of parasitic powering through the I/O pins.

You can use a simple driver and relay to switch the 2nd Arduino
https://www.electroschematics.com/arduino-control-relay/

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thanks for the tip

You're welcome.