This is the cheapest and most basic Arduino kit for the beginner, has all the component you need to start Arduino, Raspberry pi.
With more than 200pcs components,all of them would be useful in your experiments.
100% compatible with Arduino UNO R3, MEGA 2560 R3, NANO, Arduino kit.

OSOYOO robotic car learning kit is designed for beginners to learn Arduino programming and get hands-on experience on robot design and assembly
The kit comes with a step-by-step tutorial which evolves from a simple car with basic movements to a multi-functional robotic car controlled by mobile APP. Tutorial has 5 lessons which include detailed sample code with comments, circuit graph, assembly instruction and video. Even if you have no programming experience, you can follow the step-by-step instruction and gradually become a master.
This kit contains module parts including: Ultrasonic Sensor module, Tracking module, Infrared Remote Control, Bluetooth module and WiFi Expansion board etc. With these modules, the robot car can work in multiple modes such as auto-go, infrared control, obstacle avoidance, line tracking. You can use our Android APP to change working mode through Wifi or Bluetooth.

This is an UPDATED OSOYOO Starter Kit, developed specially for those beginners who are interested in Arduino
The kit has 29 projects and 24 items in cheap Price for the beginners.
You can learn the basic concepts of buttons, resistors, sensors, IR remote control and receivers, how to use sensors to detect environment(i.e. light, temperature), and how to use 74HC595 Shifting Register IC to extend Arduino Digital Ports