resources for learning the Dutch?

The best resource is a data base. Example:
https://www.chessgames.com/perl/chessgame?gid=1978386

Search 'dutch'...
Good Chess Openings Books For Beginners and Beyond...
https://www.chess.com/blog/RussBell/good-chess-openings-books-for-beginners-and-beyond

earch 'dutch'...
Good Chess Openings Books For Beginners and Beyond...
https://www.chess.com/blog/RussBell/good-chess-openings-books-for-beginners-and-beyond
Russ: If there was an Academy Award for chess.com blogs, this one would win easily. It's carefully thought out, thorough, well constructed, and very helpful.
@TheNumberTwenty: The first book about the Dutch on Russ's blog, Neil McDonald's "Starting Out: The Dutch Defence", will give you a good head start on all 3 Dutch systems. It won't make you an immediate expert, but it clearly explains the concepts involved and thereby gives you a solid basis for learning the details.
It depends largely upon how computer literate that one is and all that it entails.
If you wish to be on the up and up then wot has been recommended should be a good start.
If on the other hand you have a reasonable VPN, virus scanner and are not adverse to some risk then you are a couple of on-line libraries with plenty of books on the Dutch.