Can a portable generator power multiple circuits in a house?
The key is that you want to get everything out from one circuit on the generator and into your house (interlock, subpanel, etc.) Fortunately, you have a 240V/50A outlet - that will do the trick. That's enough to use the full output of the generator and to power most of a house - practically speaking, if you are careful with the big loads (electric water heater, air conditioner, electric dryer, electric oven) you can run your whole house with one of these.
Post specifics about your home's breaker panel and the pros will tell you exactly what to do.