Firstly, blogs are the most easiest content marketing type to start with and also the most popular content type that comes under the umbrella of content marketing. However, your content marketing strategy can include other content types too like emailers, case studies, newsletters, white papers, listicles, videos, webinars, podcasts, etc (like its mentioned above), based on your business type and the kind of results you want.
Writing short and long-format blogs are a good way to start. However, we do not need to remember that writing blogs is just one part of the content marketing process. You need to optimise it, search for the right topics, keywords, and then distribute it to make it rank and enable it to drive traffic to your website. You cannot expect results just by writing blogs.