Editing Save File

What's going on guys.
Can someone drop a detailed (or not) instruction guide on how to edit a save file?
I did it before using a cookie grabber and flynn, but that seems to be outdated. I keep seeing that people are manually editing their files, but no explanation.

There is a guide easily found on this site by the title of 'Gain Everything': https://www.mpgh.net/forum/showthread.php?t=1533962.

This should shed some light on the subject for you. If not, feel free to reply to this reply so I can provide further help, however, I may not see it.