When you have to feed yourself from a dorm room that doesn't have a kitchen, you need a few supplies. Most dorms allow microwaves, but not electrical devices like hot plates or toasters. Get a couple of microwave-safe bowls, a few good knifes, measuring cups and spoons and basic utensils like a spatula and wooden spoons for starters. These help you to make the most of the cooking you are allowed to do in your room.
When first learning to cook, there is no need for over-complicating things. Get your hands on a good, basic cookbook and look online at recipe websites for a few solid basics that require a few ingredients you can master. Start your own recipe file with new favorites as well as the recipes you love from home.
Learning basic food safety rules is important for any cook. For instance; no perishable food should be left out for more than 2 hours. So, left over pizza that sat on the counter all night is not safe to eat for breakfast. Any utensils and cutting boards used to cut raw meat should be washed well with soap and hot water before put away or used for any other product.
If you share a dorm room or an apartment with a roommate, some basic etiquette is necessary when it comes to cooking and food. Label your containers well, so your roommate knows which food is yours. Communicate with your roommate about food allergies or aversions, and do your best to be accommodating. Cleaning up after yourself is as much a part of cooking as eating, especially when you share your kitchen space with others.