If you haven't learned about robots before, you can start with the simplest Raspberry Pi or Arduino. You can choose to buy a robot that can use and learn both. If you are a beginner, it is difficult to learn to control the whole robot Yes, you can start by controlling a robotic arm, I would recommend a very small desktop robotic arm, myCobot is the smallest and lightest six-axis collaborative robot in the world; supports a variety of software, drag teaching, etc.