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.

3 programing languages — C, Python and Java, Java project has graphical interface.
Best tutorials — 401 pages detailed tutorials(PDF), start from the most basic electronic and components knowledge.
Rich projects — 57 projects, each project has detailed circuit connection diagram and code interpretation.

3 programing languages — C, Python and Java, Java project has graphical interface.
Best tutorials — 391 pages detailed tutorials(PDF), start from the most basic electronic and components knowledge.
Rich projects — 53 projects, each project has detailed circuit connection diagram and code interpretation.

SunFounder Universal Kit contains several universal components for you to learn knowledge about Arduino and electronics.
With detailed user manual containing 9 projects, code, Fritzing images, datasheets, and so on.
The user manual [PDF] can be downloaded from Technical Specification in the Product Information.

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