Hi Rachel, also a lot of times you may want to snap points on to existing parts of objects like draw a line starting at the midpoint of some existing line. For doing that type of stuff you can use "Object Snap" - make sure it is enabled in the bottom toolbar, it will have an orange highlight on it when it is turned on. Then when you move your mouse nearby key points the current point you are picking will lock on to them, when you can use that it tends to be more convenient than typing in coordinates.

Also a lot of commands have their own individual numeric controls like when you're drawing a circle you can enter in the radius, or when you're drawing in a rectangle you can enter in the width and height - these commands often involve picking a point as well for the starting location like for the center of the circle. For picking the starting point when you type in coordinates, your keystrokes go to the x,y,z input box in the bottom toolbar. When you're on the next stage like with circle where you are then picking the radius in the second stage of the command you will see a new "radius" input field show up in the upper-right area of the main screen which is where all the options for a specific running command show up. When a command has an input field available like that then when you type characters your input goes into that field, so for instance if you want to draw a circle with its center at x = 24, y = 44, z = 2 with a radius of 3.5, you would start the circle command, and then type 24,4,2 and push enter (here your keystrokes have gone into the bottom x,y,z input field), and then at the next prompt where it asks you for the radius type in 3.5 and push Enter again - on that step your keystrokes will have gone into the radius field in the command options area.

So individual commands also have other numeric controls that you can use for their particular tasks as well.

- Michael