what is string and what is bool. the ex5. says "cannot implicitly convert 'string' to 'bool'. please help this new bee.

am trying to create a zigzag bot but couldn't get the condition right. I need help from anyone that can help to improve my knowledge on this botzigzag bot creation

am trying to create a zigzag bot but couldn't get the condition right. I need help from anyone that can help to improve my knowledge on this bot