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If by legacy OpenGL you mean immediate mode OpenGL where vertices are drawn with glBegin() and glEnd() and overall a lot of vertex storage on the CPU client side memory then it will involve changing how your data is drawn to the screen by using framebuffers, shaders, buffers and better draw call methods such as glDrawElements() or glMultiDrawElementsIndirect() to make rendering more GPU oriented. Of course this is just a vague direction but maybe have a read of https://learnopengl.com and I think you can then draw comparisons between what legacy OpenGL and more modern OpenGL will look like. I think you can work from there. You may want to make a small project to try learning modern OpenGL if you have a large codebase to work with so you don't create problems with the original code. Good luck with whatever you are doing.