bootloader - How to combine a boot loader and a kernel -

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I want to create an operating system, and maybe a pre-built bootloader and kernel such as GRUB and maybe Linux kernel I write in System C. I know there is no need for any other OS, but I want to do it for academic purposes and want to know how the computer works at lower levels. I'm not sure which kernel I should use after downloading a bootloader and a kernel, how do I 'combine' or 'put them together'? Once I had done this, how do I print a message on the screen using C? I'm starting a lot in OS development, and I really appreciate it if someone can help me or tell me the articles I'm trying to do / connect bootloders and kernels I am
I do not want to code my own bootloader or kernel just in the rest of the OS
Any help is greatly appreciated.
Thanks in advance

I followed the guide and used grub-mkrescue.


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