4WD Arduino robot for my kid

It is school holiday and have some plan to buy something for my kid to learn arduino
Figure that this may be fun

Dfrobot MiniQ 4WD cross country robot

To be exact i do have similar 'robot' but i figure that this ready made is fun to learn. i will do it first then only pass to my kid to learn
There are 8 lessons for beginners, from entry-level to line-following, obstacle avoidance, and remote control. Users can easily grasp through the tutorial. All codings and tutorials are open and free to download.
Lesson Lists:
lesson1. Get to Know Your Robot
lesson2. Control Buzzer
lesson3. Light Direction Indication
lesson4. Line_following
lesson5. RGB LED
lesson6. Obstacle Avoidance
lesson7. Encoder
lesson8. IR Remote Control