Of course you would want to start out with the Holland Lop Rabbit Specialty Club http://www.hlrsc.com/
and the American Rabbit Breeders Association
https://www.arba.net/
I can never get enough of this site, when learning about the colors. By learning about the colors and what colors can be bred to another this also helps me to learn the breeding practices of other rabbitries.
http://www.gbfarm.org/rabbit/holland-colors.shtml
I appreciate the breeding information on this site and wish it were used by more breeders. http://www.amysrabbitranch.com/Color&Genetics/Color%20Breeding%20Chart%202011.pdf
And I find this site helpful in showing great pictures of standard measurements for your Holland.
http://oakridgerabbitry.weebly.com/holland-lop-type.html
Pretty much everything else you would want to know about caring for rabbits
http://www.thenaturetrail.com/rabbit-equipment/
and the American Rabbit Breeders Association
https://www.arba.net/
I can never get enough of this site, when learning about the colors. By learning about the colors and what colors can be bred to another this also helps me to learn the breeding practices of other rabbitries.
http://www.gbfarm.org/rabbit/holland-colors.shtml
I appreciate the breeding information on this site and wish it were used by more breeders. http://www.amysrabbitranch.com/Color&Genetics/Color%20Breeding%20Chart%202011.pdf
And I find this site helpful in showing great pictures of standard measurements for your Holland.
http://oakridgerabbitry.weebly.com/holland-lop-type.html
Pretty much everything else you would want to know about caring for rabbits
http://www.thenaturetrail.com/rabbit-equipment/