Article writing involves writing blog posts for website owners. It requires a higher level of skill compared to academic writing.
Copywriting involves writing sales material for companies. The highest paying form of writing. Not beginner friendly.
Ghostwriting involves writing books (both fiction and nonfiction) for clients. The hardest type of writing to crack.
Pro tip: Academic writing is not the beginning and the end. Start your Writing Journey with Academic Writing and transition into higher-paying writing categories (Copywriting comes to mind).