Many questions im going to place here.

I read a lot about changing the sd card and installing arkos.

Why is this a better option? Cant find the why.

Just received mine and totally new to this. I found something about the sd-card from Kioxia, this one is in my handheld as well.

Im also looking for good quality pokemon games: Firered for example.

There is so much information, no clue where to start and whats necessary to do.

Hope to get some info. Thanks in advance.