Number one
No one is born a cook, you become one. Where there’s a will, there's a way. Even if you don't have a lot of time, there are plenty of delicious meals that can be thrown together in minutes and, most importantly, have high nutritional value!
Number two
Times have changed. Unlike in the past, when recipes or cooking methods were passed down through generations by word of mouth, today access to relevant information is very easy, without restrictions and with easy filtering of information depending on the type of cuisine, the complexity of the recipe or any other parameter you set.

Number three
Cooking doesn't require effort; it requires a method. You should first think about what you like and how it could be enriched nutritionally, for an even healthier result. Then you can search for the right sources of cooking information and guidance that suits you. There are many sources where you can find information on how to cook. More specifically, you could consider:
Cookbooks
The most traditional way is cookbooks. You can find many cookbooks on the market, with the necessary illustrations, ingredients’ lists and techniques, so that you get a perfect result. It’s best to not go straight in the deep end - choose easy recipes for beginners so you’re not disheartened by the first thing that may go wrong. Έξτρα tip: If you like the way a particular chef cooks, then search for his recipes.
Internet
The internet is a treasure trove of free information, so make the most of it. There are plenty of videos by well-known or lesser-known chefs, as well as ordinary people who teach the basics of various recipes, usually guiding the viewer step by step.
Cooking classes
There are various cooking classes available for all levels of skill in cooking, from amateurs to more experienced cooks. Participation is either free or offered at a small cost. A search online will help you locate the place and time of the classes, so you can choose the one that suits you best. Alternatively, there is always the solution of online lessons, where your physical presence is not required, and you can also replay the lesson later if you need to.
Let your instinct guide you
Many people follow their instincts when they start cooking. Try it, you have nothing to lose - and who knows, you may find there's a master chef in you!
Anyone can learn to cook as long as they really want to. As difficult as it may seem at first, if you persevere, your effort will be rewarded. After all, proper nutrition is the key to a healthy lifestyle. Accordingly, by limiting –or even removing completely– junkfood from your life and replacing it with more nutritious meals, you'll have taken the most basic step in the right direction. The rest comes naturally.