[gus_massa]

A long time ago, we bough to our daughter a SparkFun kit, similar to https://www.amazon.com/SparkFun-15257-Arduino-Mini-Starter/d... or https://www.amazon.com/SparkFun-15254-Arduino-Mini-Starter/d...

it was a kit that has a breadboard, wires, and some assorted small components like leds and resistors, and some printed cards with projects to make and how to connect the electronic components. Check that the kit you buy has them. It's more expensive that buying each part separately, but it's much easier.

We later bough her some additional leds (you never have enough leds!) and two 7 segments displays, that are nice to show numbers. (There are two methods to connect the 7 segment display, we bought the wrong one and later the correct one. They are not expensive.)

I think the kit has some photoresistor and temperature sensors. It didn't have too many, but a few are nice.

We bought it a long time ago, so to dim a led you can send a signal that is up during some short time and down during same short time. It's good enough for leds, but it's impossible to use it to play music (even crappy one note music). I'd strongly recommend to buy one that can play music. Perhaps now all the available models are good enough to play music. (Anyone has more info or can point what to check?)