The R4 WiFi is already equipped with Wi-Fi communication, thanks to the onboard ESP32-S3 module ... started with Arduino and don't already have a project in mind, the Uno Rev3 is what you want ...

[Brian] first reported a new $5 WiFi module back in August. Since then there have been an explosion of awesome projects utilizing ... an on-board ATmega328 for Arduino Uno compatibility, and ...

If you have an SPI/SDIO port free and an ESP32 module handy, this might just be the perfect WiFi card for your Linux project!