Skillets tend to be made solely of metal, meaning they are oven safe compared to plastic handled saucepans.
Not always. Some recipes calling for a dutch oven are first heated on the stove top to brown meat before adding other ingredients and placing in the oven. Most "oven safe" dishes are not safe to use on the stove top burners. But it would be safe to brown the meat in a skillet then transfer it to an oven safe dish for oven cooking.
Yes, just prepare the skillet (as long as it is oven safe) the same way you would prepare a baking pan. Fill the skillet to the same amount you would a cake pan making sure you don't overfill it so there won't be any spillage. As a matter of fact the original "pineapple upside down cake" was originally baked in a cast iron skillet. This is the traditional and authentic way to make that type of cake. Your cake may not be as thick as with more common baking pans, however, as long as the skillet is oven safe, there is no reason why you couldn't use it.
Yes
You can grill sandwiches in a skillet, broil them in the oven, microwave them, and cook them in an oven.
Yes, in skillet, on top of stove.
Only if it's thick or flexible enough to endure the rays and heat. Check with the skillet's manufacturer.
Yes, most Libbey glass is oven safe. The glass is only oven safe to 450 degrees. The glass is also dishwasher safe.
Yes, it can. A toaster oven is like mini oven, literally, a oven safe glass dish can be put in a toaster oven
yes it can but if it has rubber on the handles it will melt
Use a wire wheel on a drill to grind it off, then re-season the skillet.
Yes, Novica tableware is mostly dishwasher safe. However, not all are oven safe.
A painted steel bowl is oven safe, as long as the paint is enamel.