3DS Ripping Catch-All Thread

[nyandere]

I hope this isn't in the wrong place, but are there any guides on how to extract images from 3ds games? I do understand that there's variations on file types within the games, but I've been googling around and can't figure this out at all. Rather than beg for someone else to rip what I'm looking for, I'd like to do it myself, but I need help on how to even begin.

edit: After trying stuff more, I've managed to get a decrypted dump of the game I want to get sprites from. However, none of the files I think are what I'm looking for are of filetypes I can find information on. Does anyone know what to do with .jtex and/or .bjae files?