It just so happens that I have some links to gray card information. Pay particular attention to the first one, and Thom's discussion of 12% gray cards.

http://www.bythom.com/graycards.htm
http://digital-photography-school.com/how-to-use-a-gray-card-to-get-more-accurate-exposures-and-color/
http://www.digitalphotomentor.com/how-to-use-a-gray-card-for-custom-white-balance-and-metering/?utm_source=Digital+Photo+Mentor&utm_campaign=f5fb80c5b2-DPM_Blog_Broadcast&utm_medium=email&utm_term=0_ec33f1d0c3-f5fb80c5b2-263056661&mc_cid=f5fb80c5b2&mc_eid=fddc3ab094

Hello Ladies and Germs,

I have Been taking photos using manual for a short period of time. I guess a couple months now. I went to a wedding this Sat. with our camera. I had a little hope that the skills I have been studying might show up in the photos I captured. Sadly it was an unhappy result. I was not doing this for anyone but my experience. Nobody was counting on me but me. Most all photos taken in auto were satisfactory to Good. Most of the manual focus photos I took were out of focus blurred or otherwise virtually unusable. When in live view the screen looked acceptable for taking but end result was not. I did not use a tripod at all as I did not want to interfere with the real photographer. I believe there was vibration or movement showing in some of the photos but not all and none when in auto. Needless to say I am disappointed that even a modicum of competence was not displayed in my endeavor. Lighting was horrible but not an excuse. Just venting frustration.
Have a good day

Yes, sometimes I'll go old school and use a 18% Grey Card. I've found my cameras anyway are pretty damn accurate for exposures, even going back to my film Pentax K2 DMD to say nothing of my Pentax DSLRs (Hell, even my CellPhone makes accurate exposures). Most often I find I'll use a grey card is if I am using a totally manual lens and find I don't like my initial starting point exposure with a digital camera. I use grey cards only for exposure setting with either the camera's meter or a hand held light meter.

For setting White Balance (if done manually) I may use a White Card. I find the various Kodak Grey cards I have adequate. I have not settled on a white standard; printed card or white piece of paper.

I received the same e-mail. However, I have yet to see how to access the 2018 version.
*******************
Hello!
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Product Platform Qty Price
ON1 Photo RAW 2018 Mac/Win 1 $0.00
Subtotal: $0.00
Tax: $0.00
Total: $0.00

I am currently in New Mexico traveling with my wife. I recently purchased a d7100 and practiced with it before I left. To hedge my bets, I an shooting in both RAW and JPEG. I typically have been shooting landscapes with several different lenses , all Nikon. Obviously, I have not processed any pictures. I normally shoot in aperture priority.

After I take my shots, and look at the pictures on the lcd screen, they consistently look over exposed. Enough so that I also take a duplicate shot using one of scene modes, something I prefer not to do. My white balance is set to daylight most of the time. I vary my ISO depending on the shutter speed desired vs aperture.

Am I doing something wrong or do RAW pics look this way on the screen? I wish I could send you a sample, but all data is still in camera. This is my first time shooting RAW.