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So I made a OS called Atlas32 https://github.com/zeerak587-cloud/Atlas32.git/
I am developing a Graphics mode for basic image display, but can someone tell me how to make graphics and how to display text in graphics mode?

Your bootloader needs to ask the firmware (BIOS) to set up the display. You can choose either standard VGA graphics modes or VESA VBE graphics modes.

Displaying text in a graphics mode works the same as displaying anything else: you set each individual pixel to the correct color.

You may find some helpful information on the wiki.