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Next to obstacle avoiding robots, the most common beginner bot would be a line follower. I myself love line followers, and they are some of my favorite weekend builds. It's just so fun watching a little bot following little black line over and over, but that's just me :-). There are also many practical uses for line following on a robot. Simple fixed navigation, docking guides (i.e. finding a charging station) as well as competition and many other uses. A basic line follower is not all that complicated ...
This is a companion discussion topic for the original entry at https://community.robotshop.com/index.php/robots/show/simple-line-follower-robot-using-a-actobotics-runt-rover-sprout-shr