Games (EMUs/ ROMs) for kids

Hi all,

can you help me with filtering games for kid ?

I purchased Trimui Smart Pro handheld for my son for 10th birthday with 128GB card and games, but there are so many duplicates and small old games that are not interesting.

Can you help me what i can safely remove ? from what i saw there are many old console that have same games so i just want to know why should i need 6+ Nintendo emulators and another few sega emulators with too many same games on every console.

Also i have arcade emulator and CPS1 2 3 and so on, which are best to keep ?

Or is it really best to have all of them ? and choose game by game ?

Also i can find same games but Europe /USA / World. What is that ?

Sorry maybe for stupid questions :)

Thank you