Ground Traces Routing - Espressif Systems ESP32 Design Manuallines

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It is recommended to separate different power traces from each other by ground
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traces and to plate copper for power supplies on adjacent layers to avoid
overlapping. It helps to reduce mutual interference.
In the figure below, red and purple represent power copper for different purposes, and blue
represents ground copper.

2.3.2. Ground Traces Routing

Different reference ground planes should be separated. Please keep the cutting lines
consistent on all layers and drill more ground holes around the 0R resistors that connect
the reference grounds. It is also recommended to drill as many ground holes as possible
close to the devices' GND pins, especially in the area of the power supply's filter capacitor.
If there is a thermal pad in the middle of the chip, it is suggested to drill no less than 9
evenly-distributed ground holes.
Espressif
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Figure 2-10. Recommended Power Routing
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2. PCB Layout Design
2019.01