Can I become a successful C++ developer or Quant trader?

In every tutorials, blogs, articles, we have seen written ' for beginners ' . But for what type of beginners? I need u to assume 2 cases :- Software engineering isn't for everyone. One can be hardworking for years and learn DSA but we can't say he is intelligent if he isn't able to understand concepts in first attempt ( as it is obvious if someone is studying something for a long period of time he is going to remember/understand/memorise it ). BUT THEY WILL WORK AT LOW PACKAGE FOR THIER WHOLE LIFE or may be he drops the idea of becoming SE. On the other hand, if there a guy whose thinking ability is good, can understand things in one go, doesn't memorize the code and have the all basic concepts clear in mind. WHO CAN BECOME A SUCCESSFUL C++ DEVELOPER?