This is a great website to reference the nutritional facts of many different foods so you can learn their macronutrient profiles. You can adjust the serving size to help you determine how much of a particular food you need to eat to hit your macro goals or stay within your caloric requirements.

Fat Fiction is an enlightening documentary that features the history of how fat was unfairly demonized. The documentary also follows an experiment in which three participants try the keto diet and then switch to the standard American diet, all while tracking key health metrics.