General LED/light modding

I'm fairly new to all this and it's incredibly difficult to find certain information about certain things within the wealth of knowledge people have amassed here. It's amazing yet overwhelming.

I was just looking for some basic information.

What is the best way to add in LEDs to a system such as a gameboy/controller/console/electronic device in general. Currently refurbishing an original Digimon and wondered if I could add some form of weak light to the screen. While I was thinking about it, realised I wasn't actually too sure on how to do this for other electronic devices.

I have some basic electronics knowledge and took it at school but it's been sometime since I've touched the subject. Any insight would be fantastic.

Thanks for any help! Sorry if this is too basic for people.
 
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