Take a look at the following list of ERC errors:
Why is Eagle CAD showing Warnings for the voltage supply connections? For example:
POWER pin U1 VIN connected to VBUS
I know these pins are connected to the correct supply voltage, so do I just approve them?
Answer
This is a stupidity of Eagle. Unfortunately you get these warnings when a supply pin is connected to a net with a different name than the pin.
Even worse, Eagle will implicitly connect a supply pin to a net of the same name. I and many other people, judging from the Cadsoft forums, think this is stupid too, but Cadsoft has so far refused to fix this.
Don't get the overall wrong impression of Eagle. It's a great package offered at a great price, and that's what I use too. Like any complicated piece of software, it has its quirks and some downright dumb choices.
A few other things to get used to: Lines are drawn with the WIRE command, except when they represent wires, then you use the NET command. CUT doesn't do a cut, but a copy, and COPY never seems to do anything useful.
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