Preheat oven to 375 degree Fahrenheit.
Cook the lasagna sheets according to instructions in the package. Make sure to use enough water (boiling water) to cover the lasagna sheets, or it won't get cooked properly. After you put the sheets in to the boiling water, give it a minute so the sheets will become slightly soft and you can gently press with a spatula so the sheets will get immersed in the water. If there is no enough water, make sure to add more water.
Once the lasagna sheets are cooked, drain the hot water and I recommend adding some cold water to the same pan, which will help you to easily transfer the lasagna sheet from the pan. Transfer the cooked sheets to a foil greased with little oil.
Once the sheets are transferred to the foil or any flat surface, grease your palm with some olive oil and sprinkle some olive oil over the sheets and gently grease each sheet with olive oil, which will help to prevent the sheets from sticking together.
Preheat the oven to 375 degree Fahrenheit.
Grease a large baking pan with oil(you may use a 13*9 inch baking pan or use any baking pan that can fit the sheets).
Add few spoons of marinara sauce to spread over the baking pan.
Add lasagna sheets on top of the sauce in a single layer.
Add more sauce over the sheets and spread evenly.
Add shredded cheese over the sauce in a single layer.
Place the next layer of lasagna sheets in a single layer.
Again, repeat the process by adding a single layer of sauce which is topped with enough cheese in a single layer.
Repeat this process until the top layer of lasagna sheets are placed (do not add cheese above the top layers now).
Once the topmost layers are placed in a single layer, add enough sauce and spread the sauce evenly.
Cover the baking pan with foil and bake in the preheated oven for about 20 minutes.
After 20 minutes of baking, remove the covering foil and top the lasagna with shredded cheese as desired.
Cover the baking pan again with foil and bake for another 10 more minutes.
After 10 more minutes of baking, open the pan and see if the cheese is melted enough. You may keep the pan opened, and bake for another 5 more minutes, if needed so that the cheese will be bubbly and golden brown (do this only if you desire, you may also broil it for the final 3 to 4 minutes if you like).
Allow the lasagna to cool down for few minutes, slice and serve!