How to make color sensor

How to make color sensor if make red led with ldr it will show red color
If i make blue led with ldr i will show be color
Opamp is used

Sorry this does not appear to be a KiCad question but a design question. Try EEVblog or maker forums. Others may have other suggestions for better forums to ask in.

How to make pcb for led scrooling usa

You need to learn electronics first. That isn’t what this forum is for. It is for questions on how to use the software.