As a beginner, you will have to understand the basics and fundamentals of digital marketing. You may take free courses provided by Google, Meta, Moz, and more trustable sources.
Digital marketing is a vast field. It would be more helpful if you pick up a niche in which you want to specialize as per your interest or forte.
This is a good way to apply all you have learned about digital marketing and craft your skills. On WordPress, Blogger, etc you are allowed to create a free website with your own domain.
While working in the digital space it is important to have your own online presence. Create a digital portfolio showcasing your skills and projects you have worked on.
For building your network you can take part in several online or offline events available related to digital marketing. You can also create your LinkedIn profile.
Taking projects as a freelancer may help to increase your experience as a digital marketer. You can create your profile on trustable freelancing websites.