To stand is to be upright or vertical, with your feet on the floor, or to move into that position. Most people stand when they hear the national anthem at a baseball game.
If you place something in an upright position in a certain spot, you stand it, and objects stand when they're situated in a certain location: "Those beautiful buildings stand at the top of the hill." A support where an object will be placed is also called a stand. When you stand for something, you believe strongly in it, and you can also describe that belief as your stand: "My stand on the school dress code isn't too popular among other students."