If you decide to make your own business ( maybe an indie game studio who knows ) you need to know some marketing. I won't teach you marketing, but I will teach you how to learn. Google has a very good course for you named digital garage. You can find it here https://digitalgarage.withgoogle.com/ . They teach you important things like how to sell stuff ( like games ), how to make a presence online, how to be known by other people etc. When you finish it you will get a certificate that you can add to your cv. Maybe you can get a job with it. Anyway, I considered that this practice is very good for someone who has an indie studio and wants to have more players.