Best is 3...e5xd4
Best response to 3. d4
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Possibly helpful:
Bologan's Black Weapons in the Open Games
http://www.jeremysilman.com/shop/pc/Bologans-Black-Weapons-in-the-Open-Games-76p3873.htm
Starting Out: Open Games by GM Glenn Flear (2010)
https://web.archive.org/web/20140626232452/http://www.chesscafe.com/text/hansen134.pdf
Play 1 e4 e5! by Nigel Davies (2006)
https://web.archive.org/web/20140626201436/http://www.chesscafe.com/text/hansen80.pdf
https://web.archive.org/web/20140627083715/http://www.chesscafe.com/text/hansen98.pdf
The Kaufman Repertoire for Black & White by Larry Kaufman (2012)
https://web.archive.org/web/20140626221508/http://www.chesscafe.com/text/hansen162.pdf
Opening Repertoire: The Open Games with Black by Martin Lokander (2015)
https://www.newinchess.com/Shop/Images/Pdfs/7546.pdf
Playing 1.e4 e5 - A Classical Repertoire by Nikolaos Ntirlis (2016)
https://www.newinchess.com/Shop/Images/Pdfs/7572.pdf
What is the best way to respond playing as black to 3.d4
I've encountered this a few times and I always mess up. Thanks!