The ability to draw is not something that people are born with and the skills to draw can be taught to anyone. The best way to learn to draw is to approach the art as both a study and a practice.
By practice, it means that you actively work at learning the fundamentals of the art and building a foundation upon which your skills may evolve. You practice daily at repeating exercises that help build muscle memory and improve techniques. Practice drawing what you see, practice drawing from live models, practice drawing in different perspectives and from different points of view. Practice!
By study, it means that you seek out inspiration and influence from others; whether that means from studying "The Masters" or simply by creating art with other artists and participating in the useful feedback that is available from critique. Look at what other peers are doing and learn by asking questions and studying their methods and techniques.
Study Design Fundamentals.
Build a foundation for your artwork in traditional design.
Study Color Theory.
The Josef Albers Color Theory App is a beautifully designed exploration of color theory that is taught in many Universities when it comes to studying the arts.
Study Perspective
Study Architecture
Study Life Drawing/Anatomy
Practice your art form just as any musician would practice scales, an athlete would practice training in the gym, practice to stay at your best. When you slack off from your art form you notice that you are not on your game. Take the 300 Box Challenge and draw 300 boxes with different perspectives and points of views over the next several months. Draw every day and when you open your sketch book warm up by drawing 5-8 unique boxes. Please share how this improves your ability to draw anything you want!
Practice! Practice! Practice!