Strongly recommended · for some experience
KiCad 9: Design & assemble an ESP32 IoT 4-layer PCB loaded with goodies **A Complete Guide**
Why people recommend it
Tech Explorations covers a four-layer IoT board in KiCad 9 from design through fabrication to testing, and is rated among the most thorough KiCad tutorials available.
Watch for: Over five hours long; set aside time