There are plenty of easy things to make!
Think of the pre-packaged salads you usually buy and then try to replicate them. Start with a bunch of mixed greens as a base. I like fruit in my salads- one thing I might do is spinach, sliced strawberries, blueberries, and blue cheese crumbles with a balsamic vinaigrette. Or for more savory, mixed greens, some drained, rinsed chickpeas from a can, some sliced kalamata olives, some feta cheese, and some grape tomatoes. Once you start making them, you will start learning what you like. Greens with hardboiled eggs, tomatoes, cucumbers, and light ranch is great and super simple.
What about bean burritos to take for lunch? Buy a can of fat free refried beans and get some of those low-calorie wraps. Put some beans in a wrap, top with salsa and lots of salad greens/cilantro. Roll it up, wrap it in plastic wrap, and you're good to go!
Soup is really easy to make, probably a good thing to start with if you're learning to cook. Plus, you can keep tinkering with it until it tastes right to you. It's almost impossible to muck up! My advice would be to start with pre-made vegetable broth, though, because making a stock can be difficult and the pre-fab stuff is pretty decent (just try to find the low-sodium kind).
I second the idea about frozen veggies. One of the things I like to do is take one of those little Velveeta single-serving macaroni and cheese meals and cook that in the microwave, then while it's cooling, cook a half a bag of frozen broccoli. Then I mix them together. It's plenty of sauce to cover both, and it comes in around 300 cal for a very easy and filling meal.
I've said for a long time that if you can read, you can cook. Look up recipes and get ideas. Look for easy recipes at first. The more you do it, the more confident you will get and the more you can improvise and make different things. Cooking can be a great joy and a stress reliever, plus it feels wonderful to make food for someone else. It's as easy or as hard as you want it to be.