Well. Depends on who you ask. If you want to rap at a basic level, you could read a Cat in The Hat book aloud with rhythm on a beat, you're already on your way. If you wanna be a great rapper, it'd take a lot of work. And that's just on techniques alone, you also gotta work on your content and think of creative concepts too. Never mind working to develop the full potential of your rap voice. It's easy to hop on the same damn pseudo-Young Chop/Key Wane/Zaytoven/DJ Mustard/Metro Boomin beats and talk the same shyt everybody else talks about. It's harder to go take a beat and do something that has more meaning to it, that's also a breath of fresh air.
But see that's the issue. nikkas see where the money's at and hop on that train. You can't blame them. But at the same time, the culture and art form can suffer because of that. However on the flip side, when you do get a Kendrick Lamar, a Drake, a Lupe Fiasco, a J. Cole or a Kid Cudi, they stick out that much more. They're different, they stand out. They have different styles and they all are creative. Even though their topics may be about the same things other rappers talk about, it's done in a fresher and a more creative way. However, that doesn't mean that ignorant/party/hype/drill/trap rappers don't belong here either, there's a lane for everybody. Music is entertainment, and the goal is to entertain. So if those rappers succeed in that, then there's no issues. A lot of backpackers and purists don't understand this though and just want Hip Hop full of Immortal Techniques, Jedi Mind Tricks and other super underground dudes.