How to make color sensor

Projects
1

Hello
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

2

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.

3

Hello
How to make pcb for led scrooling usa

4
5

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