How to prepare for LPM best

Going over the code samples to learn how to best prepare for LPM I found:

  • Radio.Sleep(); => LORA
  • Wire.end(); => OLED
  • Serial.end(); => Serial

Plus the following I’m not sure about:

  • detachInterrupt(RADIO_DIO_1); => LORA - Attach after wakeup? Is this done automated when going in receive mode?
  • pinMode(Vext,ANALOG); => Use right now “pinMode(Vext,OUTPUT); digitalWrite(Vext,HIGH)”. Why analog? What is better?
  • pinMode(ADC,ANALOG); => Why?

Is there anything I forgot/oversaw?

Thank you for your time & advice in advance.