Actually, It depends on your life categories and your passion. At first, you think and analyse.... what are you doing now ? Is it related to Digital Marketing?
Suppose, You are a Doctor/Engineer/any other services holder. I think that, You haven't need digital marketing. it's not related to your profession. Because your already engages in a good profession.
On the other hand, If you are a businessmen, or You want to start a new business...
Obviously, I support you that you must need to know digital marketing. Because, Digital marketing is very important for your business. Now a days, business go through on internet platform. Most of people buy any products through online.
Digital marketing is a marketing that includes promotion, selling, branding, and awareness using the internet. Digital marketing provides you with low cost and effective analysis for promotion your business growth. Digital Marketing is so effective and valuable that consumers have access to know and aware any time and any place in the world. As a result, your business visibility become so strong .
Source:quora