The more you know about cooking the more opportunities you will see to cut your weekly food budget. You will be able to reduce your purchases of prepacked processed foods and make great meals from cheaper more basic ingredients.
Rather than spending money on recipe books etc use youtube and check out some cooking videos. As you watch them keep in mind your goal of thrifty economic meals.
Even if cooking is not a main hobby of yours make it a mini-hobby and begin to take pride in your growing cooking knowledge and skills.