A blog is an online journal or informational website displaying information in the reverse chronological order, with the latest posts appearing first. It is a platform where a writer or even a group of writers share their views on an individual subject.
Web development that are relevant to you will depend on your skills, experience, and interests. If you are new to web development, I recommend starting with front-end development or web design. Once you have a good understanding of front-end development and web design, you can then decide if you want to specialize in a particular area, such as web application development, mobile app development, or web performance optimization.