Shore power and motorhome engine running

Thanks for letting me know! I also just realized that when I crank the generator the power switches from shore power to generator power and that I should turn off the a/c until it is switched over. Now I need to understand the invertor. Can I have the invertor on while driving down the road so that I can plug in something like a computer charger? I tried it once and the outlet I tried wasn't hot. Sorry if I'm going on and on but fixing to take our first long trip (1 month) and trying to get my head right about all this so nothing goes wrong.....