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 🙂
Sense Hat
The most interesting hat for Raspberry Pi.
Multiple sensors like temperature, humidity, …
Adafruit Servo
Add the Arduino features to your Pi with this hat.
Plug up to 16 Servo motors to your Pi
PoE Hat
This hat allows you to power your Pi directly from the network.
You need to have a PoE switch to power it
Professional DAC
For professional audio projects.
This hat can greatly improve the sound quality of your Pi

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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