Arduino AutoShutdown Using 5V DC Relay or MOSFET - Project

I'm learning how to use relays. I understand their basic function and have managed to build a few projects. But I came across an example that uses a relay or MOSFET to Auto Shutdown Arduino and I'm not sure if I've understood the circuit correctly. When I built this project, the Arduino powers off as soon as I release the button! THIS IS HOW I SEE IT: The relay (which is using NO) is initially LOW, meaning COM and NO are not connected and therefore the Vcc into Arduino's 5V pin is not going to

Why does my electric circuit to control a 12V circuit (solenoid) with a 5V circuit (GPIO, Arduino) using an optocopler and a Mosfet not work? - Quora

School me on relays, need help - General Electronics - Arduino Forum

Nano 33 and 8 channel relay module unwanted startup activation - IoT Cloud - Arduino Forum

Self latching power for UNO - General Electronics - Arduino Forum

DC 5V 1 Channel SSR Solid State Relay Module High low Level Trigger 5A – Aideepen

Relay-latch+mosfet - General Electronics - Arduino Forum

Automatic ON-OFF Relay Circuit

5V Relay Module With Arduino

How to Set Up a 5V Relay on the Arduino - Circuit Basics

Arduino power shutdown when relay connected - Project Guidance

Arduino 4 Relays Shield - RobotShop

MODULO SCHEDA RELE\\\' 1 CANALE 24V 10A 250V ARDUINO SHIELD 24Vdc

Arduino hangs when connecting 220v to relay board - Project Guidance - Arduino Forum

Arduino, rele y bomba de aire - Español - Arduino Forum