Although the site is an official Arduino page, it's different from the Arduino Docs, where tutorials are written only by Arduino ... your program, schematic diagram, and Wokwi link.

it’s great for a quick-and-dirty circuit diagrams. Not exactly schematics, but [Duckman] has some Arduino pinout diagrams he made using ASCII-art. These could be useful when pasted into source ...

Original Circuit Diagram: Arduino UNO R3 Now ... this is not the one and only proven method for making an independent Arduino chip. You can find numerous ideas, tips and tricks everywhere in internet.

(After noticing this change, we went back and compared the “rev3” Uno schematics PDF on arduino.cc to the “rev3E” schematics on arduino.org. Yup, same change in the legal notice.) ...