One of the best features of the Raspberry Pi is the possibility of adding extensions to enhance its capabilities
I already wrote an article about my top 13 hats for Raspberry Pi
But you have here the absolute top 4 🙂
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Sense Hat
The most interesting hat for Raspberry Pi.
Multiple sensors like temperature, humidity, …
Amazon.com
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Adafruit Servo
Add the Arduino features to your Pi with this hat.
Plug up to 16 Servo motors to your Pi
Amazon.com
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PoE Hat
This hat allows you to power your Pi directly from the network.
You need to have a PoE switch to power it
Amazon.com
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Professional DAC
For professional audio projects.
This hat can greatly improve the sound quality of your Pi
Amazon.com

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I recommend these products because I use them myself and I know them.
This is simply a list of what I use and love