Is digital marketing a good career?
Yes, marketing - especially digital marketing - is a rapidly growing field. With that said, there are tons of career paths available, such as content managers, search engine marketing specialists, content writers, graphic designers, digital marketing specialists, and more. It is up to you what you want to do with your life.
What skills do you need to be a digital marketer?
Afterwards if you want to go further and stand out from other marketers I would invest a little bit more in data crunching and analytical skills, which are getting more and more important in marketing overall and in digital marketing in particular. Look into the following:
What is the best way to learn digital marketing?
I'd suggest taking a few free Udemy or Skillshare overview courses so you understand how to structure Adwords, Facebook, and Instagram campaigns at a macro level and understand when/how to optimize. The tricky thing with digital marketing is that it's hard to "practice", seeing as you need money to actually launch real world campaigns.