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Before starting to code in C++, it is useful to learn about the variable type, the syntax, the function, and object-oriented programming. You can test simple codes and solve simple problems while learning the fundamentals.
There are many online resources available in the internet that can help you to learn C++. Most of them are free and some of them also has paid courses. There are also online communities that can help you answer if you encounter some problems when coding in C++.
You have to be consistent to take out some time daily or weekly if you want to master C++. You can also plan/set target to complete some milestones in C++ after some period of time to measure your study.
Sometimes when you don't know what's the algorithm to solve a problem and is confused whatsoever, it is better for you to try searching your problem in the internet and learn from other's codes. Don't dwell too long on a problem as it will waste your time.
To be more efficient in coding and to save more time, you can use built-in functions from the C++ Standard Libraries. You can find out more about C++ Standard Libraries or Modules in C++ through Function Dictionary. In there, there will be a link that will direct you to the documentations of some C++ libraries.