Reddit mentions of The Food and Life of Oaxaca: Traditional Recipes from Mexico's Heart

I'm not familiar with the store but since Latin American, let alone Hispanic, cooking is so incredibly diverse I'm simply going to assume you are going to start with Mexican cuisine. "Hispanic" spans 20~ different countries with climates that range from the pampas to the sub-tropics, plus Spain.

The different cuisines of Mexico are divided by region and influenced by history -- what you find in coastal Veracruz is not what you get Oaxaca. This is a really old, basic, but comprehensive thread that covers a lot of the cuisine from the perspective of a native and might help along with simply reading the wiki page on Mexican cuisine which has terms in Spanish and English. Just don't pay attention to any of the peanut gallery comments or nonsense from Americans about burritos.

This book is a classic, and covers a pretty wide range of dishes and regions.

I'm personally very fond of Oaxacan cuisine and my favorite cookbook for it is this one by Zarela Martinez, which you might be able to find at your local library. Her book on Veracruz is good too.

I grew up with many Mexican friends, and they (and their abuelas) were always my best resources for learning to how to cook. If you have friends, ask them, the worst they can do is say no.

If you don't mean Mexican food, I can also give you some direction about Argentinean cuisine which is more directly influenced by German, French, and Italian cooking as well as Spanish, since that's what I grew up with at home.