Career Opportunities
Web development skills are in high demand these days. Every business, organization, and even individuals need websites to establish their online presence. By learning web development, you open doors to a wide range of job opportunities. You could work as a software-developer building interactive applications that help people to be more productive. Or you craft beautiful web experiences as a web designer. You could even offer a service to build websites for other people. This could start as a hobby to help friends and relatives to present themselves online and might evolve into a full-time job as a web agency.
Even if you don't follow one of the examples mentioned above. There is still some benefit in learning about the web. Especially if you work as a designer in a team with technical coworkers or in a marketing job.