You are mostly correct about power for your RV. Most RVs typically have three sources of power: the cord plugged into a campground pedestal, the RV's generator, and the "house batteries". The first two are direct sources of 120v. The batteries are 12v, and need to be converted to 120v with the use of an inverter to power 120v items. Do you know if you have an inverter on your rig?
Many RVs charge the house and chassis batteries when the engine is running via the alternator. When you are plugged in, you are charging the batteries with the shore power through the converter/charger.
When you are driving, things you need in the RV will be powered by your batteries. If it is super hot and you want to run your A/C unit, you can run the generator, which will supply the A/C unit while you are driving. We run our refrigerator on propane while we are driving. There are varying opinions about that.
When you are parked, you will either be in a campground that supplies your RV with 120v power, or you will be "off grid", or dry camping, or boondocking. All of those mean that you are not plugged into anything. To be off grid, you need to supply the power either through the batteries or the generator, depending on your power needs. For the most part, the batteries will run the lights and basic things, but not the appliances. If you need A/C or the microwave, you will need to run the generator.
The generator is also used to charge up the depleted house batteries. While you are running the generator to power your appliances, it is also charging your batteries so that you don't have to always run the genny.
When we are off-grid, we typically run our genny three times a day - a couple hours in the morning to charge the batteries, make coffee, etc. We then run it for an hour or so in the afternoon to charge the batteries. In the evening, we will run it another couple hours to make dinner and charge up the batteries for the night.
For those with solar, if you have enough supply to keep up with your demand, then you won't need to run the generator. If you will spend much time off-grid, that may be a good thing to look in to. For us, we spend most of our time in campgrounds, so we rely on the generator when we are not plugged in.
The above is spoken in generalities, not specifically about your RV because I am not sure how it is equipped. However, most of the info will apply in a general way.
Let us know if this leads to more questions! :)
--kev