Can you actually make money with digital marketing? If so how?

There are so many elements to digital marketing. They can range in everything from:

Search engine optimization
Social Media Marketing
Digital Branding
Search advertising
Mobile marketing

The list goes on.

Even classified ad sites are a form of digital marketing. It probably has 100 different names. So you would definitely need to fine-tune what type of digital marketing you would want to do. You'd also need to remember that the digital world itself is ever-changing, Much like other sciences, unless you are willing to concede ahead of time that you will never be able to be an 'expert' in your field, you will probably be the closest thing to one it has.

I'll list a couple of my favorite digital marketing sites to use in resources and even a site or two focused on the varying elements of digital marketing.