There are not as many Cantonese learning resources as Mandarin, but some websites include CC-Canto, Hong Kong Cantonese Learning, the Hong Kong Lexical List, Learn Cantonese, Omniglot, the Ottawa Chinese Language School, Trip Savvy, and WikiTravel.
The Dim Sum Field Guide is an extensive illustrated collection of dim sum, and A Little Tea Book discusses varieties of tea (not just Chinese) and tips on tea preparation. Fuchsia Dunlop has written on various regional Chinese cuisines.
My favorites are cookbook/recipe/memoirs written with an Asian-American perspective, including The Boba Book, First Generation, Mr. Jiu’s in Chinatown, The Mission Chinese Cookbook, Chinese Soul Food, books by Grace Young, The Nom Wah Cookbook, The Woks of Life Cookbook, My Shanghai, and Xi’an Famous Foods.
For kids, there’s Dim Sum for Everyone!, Luna’s Yum Yum Dim Sum (also an intro to math concepts and the Chinese zodiac), the Let’s Go Yum Cha series, Yum Yum Dim Sum, and Welcome to Chinatown (no dim sum, but some food words and a nice intro to Chinatown).