The Dwarf Aquarium Lily is one of the best beginner plants you'll find in the hobby. This plant comes in a bulb in a pot and usually has several sprouts already coming out of it. When planting you will want to leave the top of the bulb exposed to allow more sprouts to pop up. 

Sometimes a stem can pop off and if it does it doesn't need to be thrown away, just let it stay in the aquarium and it'll stay beautiful for quite some time while new sprouts come up. These sprouts will grow all the way to the top of the tank and float like lily pads if you let them.