Download lesson 1 from Arduino site, preform all correct following the online instruction Verifying port and board is confirmed ok . Using windows 11
Below is the message that i get when trying to upload lesson 1 for Arduino uno R3 .
Can't open sketch: main file missing from sketch: C:\Users\jmacl\AppData\Local\Temp\f5541f63-5402-4179-a1e7-559c6699f35d_lesson-1.zip.35d\lesson1\lesson1.ino
Compilation error: Can't open sketch: main file missing from sketch: C:\Users\jmacl\AppData\Local\Temp\f5541f63-5402-4179-a1e7-559c6699f35d_lesson-1.zip.35d\lesson1\lesson1.ino
I moved your topic to an appropriate forum category @macs14.
In the future, when creating a topic please take some time to pick the forum category that best suits the subject of your topic. There is an "About the _____ category" topic at the top of each category that explains its purpose.