Reference
ESP32 DevKit V1 pinout — safe pins, strapping pins and what to avoid
Which ESP32 pins are safe to use, which are input-only, which break the boot and why ADC2 stops working the moment Wi-Fi starts. Keep this tab open.
Board
ESP32 projects & guides
Dual-core, Wi-Fi and Bluetooth for the price of a sandwich. IoT builds, deep-sleep power tricks and the brownout errors everyone hits.
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Troubleshooting
ESP32: "Brownout detector was triggered" — causes and fixes
Your ESP32 reboots in a loop and the serial monitor says brownout detector was triggered. Here is what is actually happening, ranked by likelihood.