Useful tips

Small schematic tip if you're going to use PoE in your devices related to the minimum load.

Smart approach to designing high-power dissipation devices uses multiboard construction.

Simple unobvious flag that make a change to use ESP32-S3 with PSRAM at industrial operating temperature range.

Important note about standard 4-pin PC fan when using PWM signal to control it.

Small thing, that could damage your devices and should be taken into account when using isolated DC-DC modules.

How to deal with addressable RGB LED (like WS2812B) when you have only 3.3V rail?

It's logical to just connect PHY to Ethernet switch using RJ45 Cat cable, but for real schematic you will want to use optimized solution without additional isolation transformer.

Demonstration of the Power Good (PG) pin working of DC-DC converter and where it could be useful

This advice can significantly improve your components library for achieving better precision of mechanical sizes.

How to use net ties to improve schematic and board tracing.

Using new reference designator styles (U1 -> U1501) with page numbers to improve readability and modularity of the schematic sheets.

If you make a device with external RTC module this essay can help you to make simplest backup powering (reverse power) using coin cell battery.

Simple way to make hardware revision (REV1, REV2, REV3) using only one ADC pin, that helps to easy identify board version using MCU firmware, which give a change to easy maintain all board revisions taking into account all the device schematic changes .

The only possible and correctly working way to extract (export) .step model from the EasyEDA footprint.