Not sure if I should post this here, or the newbie board. Sorry if it's the wrong place.
Are there good videos/guides out there to get someone started on being a good grader? I mean, I've been collecting comics for a long time. I know if something is nice or not, but the specifics of fine tuned grading? No idea. I couldn't tell you the difference between a 4.0 and a 5.0, etc... I have spent time reading the "can you spare a grade" forum and threads, trying to get some ideas. But, and I know in some ways it is, it all seems so arbitrary. So, just wondering if there's a real good, semi-official (or actual official), guide out there on what to look for that people have used, or still do use.