Other benefits of learning web designing & web development are:
Web development has always been an integral and central part of the internet.
Since it has overtaken all other business models and has become the most effective business model, the demand for skilled web design and developers has increased significantly.
By learning HTML, CSS, Bootstrap, Adobe Dreamweaver, jQuery and third party APIs you can put yourself in the league of elite panel of web developers. Web development is more like an art and is only limited by the imagination of the developer. It will grow and enhance with time and practice. There is no end.