Indeed, for the sake of your electrical system, if you do decide to plug your shore power cord into the inverter OUT, turn off all the breakers that you do not want to power from your inverter.
It would be easy for someone to forget and turn on your roof A/C. NOT a good idea!
Much, much safer to either wire the inverter OUT to a sub-panel or directly from inverter OUT to just those outlets you want powered by the inverter.