Web design encompasses many different skills & disciplines in the production and maintenance of websites. The different areas of web design include web graphic design, interface design, authoring including standardised code.
Web Development is the work involved in developing a web site for the Internet or an intranet. Web development can range from developing a simple single static page of plain text to complex web-based internet applications...
Digital marketing is the marketing of products or services using digital technologies, mainly on the Internet, but also including mobile phones, display advertising & any other digital medium.
Training is teaching or developing in oneself or others, any skills and knowledge that relate to specific useful competencies. Training has specific goals of improving one's capability, capacity, productivity and performance.