If you are a novice in the kitchen, it may be worthwhile investing in a cookery book. You can often pick up cheap but high-quality secondhand books in charity shops. Alternatively, the internet is an endless source of recipe ideas. The Supercook website recommends recipes based on what ingredients you have.
There are plenty of cookery books aimed specifically at students and there are also plenty of websites with quick ideas for cooking healthy, affordable meals. You may find StudentRecipes.com helpful.
Food waste might not seem like a big part of your budget but it can quickly add up. You can save money by only cooking what you need or by making bigger portions and freezing what you don't eat. Love Food Hate Waste lets you calculate how much you need to cook so there is little or no wastage. It also has some great ideas on how to re-use your leftovers.