4nm or 6nm process refers to the method that is used to make the silicon chip. It is (ELI5) a measure of the size of the smallest devices made on the chip. A smaller number is more advanced because, as the number gets smaller, more devices can be made on a similar sized chip and this makes it faster and generally more efficient.
A CPU is the brains of a computer. It is a chip that does all the general purpose computing in a computer, laptop or tablet etc.
A GPU is a specialized chip designed for graphics processing. The chip is optimized for certain calculations that are used to make graphic images. A GPU will work in conjunction with a CPU.
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