
1. On Food and Cooking: The Science and Lore of the Kitchen by Harold McGee. Not strictly a cooking book in the sense of recipes, but the most exhaustive encyclopedia / intro into the science and mechanics of cooking
2. Modernist Cuisine: The Art and Science of Cooking. The previous, but written with a "more is more" approach and an extra focus on modern techniques. More details, more pictures, (much) more volume and much pricier.
3. Serious eats Food Lab - Probably the best resource on "why/how" a given recipe / technique works that's accessible for free on the internet. I think the main author of this (J. Kenji Lopez-Alt) is also co-author of one part of the Modernist Cuisine.
4. Good Eats by Alton Brown. This used to be a TV show running for well over a decade. Alton Brown usually tries to do one recipe / technique / ingredient per episode and explain as much as he can in 30min or so. The first episodes / seasons are a bit dated (I think he goes over some of the older stuff in his later seasons), but overall probably the best TV show on cooking I ever saw.
5. America's Test Kitchen - a youtube channel. This is a bit of a mixed bag, but when it comes to a channel that I'd recomend to a beginner, I'd probably start with this. Second would probably be someone like some of the Adam Ragusea older episodes (I think he lately went into body buliding a bit too much), or some of the older stuff from "@FrenchGuyCooking" (I got to him through a video done by @ThisOldTony).
6. For recipes : personally I go for David Lebovitz. Old SF cook who moved to Paris some decades ago and at some point used to publish a lot of recipes on his website (though I have the impression he lately pivoted into more of restaurants reviews / social media, the archive is still good).
Although, lots of research has greatly improved, and I warmly recommend you to read “Modernist Cuisine: The Art and Science of Cooking” (2011).
Then, for techniques, I strongly recommend following a book designed for chefs when they learn. For example, in French, I recommend “La Cuisine de Référence” (2015) by Michel Maincent that teaches you how to select ingredients, cut them, to various traditional techniques and how to correct them if you fail, and why you failed.
Also, +1 on `Modernist Cuisine: The Art and Science of Cooking`.
If you want to get really scientific then Modernist Cuisine: The Art and Science of Cooking [1] by the patent troll is probably the most comprehensive resource available but if you're still trying to move beyond memorization, it is complete and total overkill. I would recommend focusing on the above advice rather than on trying to make the art of cooking scientific. It doesn't really matter how well you understand the science of meat temperatures when the natural variation in steak marbling can vary your cooking times by 10-30%.
SeriousEats.com is a great resource for very detailed recipes where the authors experiment and discuss results rather than just providing a single recipe. Whenever I'm learning a new dish (I don't learn recipes, I learn how to make dishes!), I go to SeriousEats, Reddit, and Youtube to find several recipes for the dish I'm trying to make. Using my past experience and intuition, I distill my own recipe tailored to the exact ingredients and tools available to me.
Other than Salt, Fat, Acid, Heat, I can recommend On Food and Cooking, The Way to Cook and The Joy of Cooking, The Professional Chef, Essentials of Italian Cooking, Ratio, Food Lab. If you're looking for a reference on combining flavors see The Flavor Bible