Some of it depends on what you are after.
Trophy buck lets say
You would be looking for a bed that is at least 40 inches long. With no other beds around. The big guys like to have a vantage point wind at there back. That way they can see you coming or smell. And have a escape route over a ridge threw some thick swampy stuff. IMHO. Sunny sides they seem to like.
For doe most or sometimes they chose easy routes . The easy spot to cross creek stream and such. You can see there smaller oval beds more than 1 together in most cases.
Of course later on when rut is in. that big boy will come to your doe at some point also.
That's enough for now i guess
Thats were i start looking anyway