When we put together one or more commands to control the Linkbot robot, we are creating a "program." A computer program is like a recipe, a series of instructions.

Often when we create a program we make mistakes, such as using the wrong command, or the right command at the wrong time, or the wrong numbers in the right command, or so on and so forth. These errors are called "bugs," and so we often need to "debug" the program in order to fix it and get it working properly. The Step button is helpful in debugging, because it will step through a program's commands one at a time. At each step the command being executed is displayed in orange in the Workspace. This lesson gives you some practice in debugging, and also introduces the turn code block, which instructs the robot to turn left or right at a certain angle (90 degrees for a right angle turn):

Tip: If you want to speed up the robot's journey, add a setSpeed  block at the beginning. (You may have to scroll down in the list of code blocks to find it.)