devkitPro

I have been looking everywhere to find out how to read save files on homebrew but can't seem to find anything.
Would anyone be kind and either send me a tutorial or something just as good.

It's hard to know what to advise without more information really.

If you want something to backup/restore game saves then https://github.com/BernardoGiordano/Checkpoint/releases works quite well.

Is that what you want or are you asking about saving data for a homebrew app?