Recommended · for some experience
#91 How to properly power the ESP8266 modules
Why people recommend it
Andreas Spiess works through powering an ESP8266 from a battery, covering the calculations involved, oscilloscope traces and adding a capacitor across the supply pins.
Watch for: Mostly applies to the ESP32 too
In their words
This is for ESP8266, but the 32 isn't that much different for power: [video] around the 5 minute mark he shows live scope traces.
Aaron on electronics.stackexchange.com, Jan 2024. CC BY-SA.