It's basic, but I'm a huge fan of America's Test Kitchen, especially the website subscription. I have the book to use as a reference, but it's an 800-page behemoth, so I'm usually only pulling it out for Thanksgiving or similar larger meals, when I'm doing multiple items at once. The website has a recipe and technique for pretty much anything you would want to cook, along with letting you filter based on dietary issues. (i.e. You can search for "chicken" and then "dairy free," which is very useful for me to just get an idea for the dishes I can cook for my wife right now.)
I use other cookbooks to kind of get inspiration for meals.
Ruhlman's 20 is a great book when it comes to different techniques. For grill stuff, love Steve Reichlen, who has a PBS show as well that I love. It's like if Bob Ross had a cooking show, just a grey haired guy that loves to throw stuff on the grill. His
grilled French toast, sans the brandy, is something I make for breakfast whenever I have time.