To make your own experience, all you need is the Arduino IDE, a Raspberry Pi Pico and the PicoSem library and you can download the zip file from: https://github.com/IWILZ/PicoSem

To install the library:

1. open Arduino IDE
2. select "sketch/include library/add ZIP library"
3. go to the folder you used to download the library and select "PicoSem-main.zip"

Now you should see the PicoSem library in your "sketch/include library" list.

Together with the library you will also find 2 simple examples that i recommend you to look at: Blink_Multicore and Bidirectional_Multicore

NOTE that inside both examples you will find two "setup()" and 2 "loop()" with the following structure:

// -------------- Core 0 -----------------
void setup()
{
   ...some instructions...
}
void loop()
{
   ...some instructions...
}

// -------------- Core 1 -----------------
void setup1()
{
   ...some instructions...
}
void loop1()
{
   ...some instructions...
}

All the code for core0 is inside setup() and loop() and the code for core1 is inside setup1() and loop1()