To make your own operating system in C++ you need to learn or know how to code in C++ and you need to learn computer science and computer programming.
To make your own operating system you'll need to learn coding and computer programming and have a computer that works great for software needed to create an operating system.
Some ways to create your own operating system are you need to.
Take some computer science courses.
Learn a high-level programming language at an advanced level.
Learn a low-level assembly language.
Complete an operating system tutorial.
Plan your operating system.
Create your programming environment.
Build and test.
Release a release candidate.
OS in coding means Operating System.
In computer coding an operating system is a software program that is required to manage and operate a computing device like smartphones, tablets, computers, supercomputers, web servers, cars, network towers, smartwatches, etc.
It is the operating system that eliminates the need to know coding language to interact with computing devices.
For example if you use Windows 10 on your computer than that is your computers operating system.
If you use Linux then Linux is your operating system.
Before regular easy to use operating systems were developed people had to use DOS on their computers which was more complicated.
The DOS was Disk Operating System.
Linux, macOS, and Windows are highly preferred operating systems for web developers.
Although, Windows has an additional advantage as it allows to work simultaneously with Windows and Linux.
Using these two Operating Systems allows web developers to use the necessary apps including Node JS, Ubuntu, and GIT.