Do you also make these mistakes in PCB Layout?

I challenged a software engineer to design his very first PCB. What happened? Links: - Part 1: Is this really how beginners design boards??? | Schematic Review https://youtu.be/YzBtfN1LQtM - Learn to design boards, check out FEDEVEL online courses: https://fedevel.com/courses Chapters: 00:00 What is this video about 00:50 Arduino compatibility 03:28 Switch 05:16 Text 08:06 LEDs 08:52 Board name and version 10:16 Spread the tracks 12:24 Connector names 15:00 Horizontal / Vertical routing 16:07 Net Color 18:10 Track width 24:09 2 Layer vs 4 layer PCB 25:22 VIAs 26:10 Placement 27:55 VIAs on power and GND 30:47 Power regulators 35:40 Stitching capacitors and VIAs 38:09 Through hole pins and thermal relief 41:30 USB 45:37 Clearance 50:36 Critical signals 54:15 Make it look nice 56:10 Reference designators 57:11 DRC checks 59:25 Does it work? ------------------------------------------------------ Would you like to support me? It's simple: - Sign up for online courses hosted on our platform: https://fedevel.com/ - You can also support me through Patreon: https://www.patreon.com/robertferanec - FEDEVEL Discord: https://discord.gg/8a8dUcHmrx It is much appreciated. Thank you, - Robert