Thingy 91 x and nrf cloud

Hi, i am learning with thingy 91 x and nrf9151dk.
I made the online courses and succesfully conect to the cloud with the nrf desktop quick start in both devices.
Now, i would like to change the code and make my own application, but i am a bit lost on how to connect to the nrf cloud with my own examples.
Could you guide me? 
Thanks!

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