|I read a lot on photo forums before shooting to upload on stock photography sites. Click here to see my Dreamstime portfolio or here to see the above image at Dreamstime.|
There are ample links online and I enjoy referring to one book that was recommended when I began shooting photographs to upload on stock photography sites.
Understanding Exposure by Bryan Peterson (revised edition) helps me key in on what I'm doing when shooting in manual mode. The book is now up to a "3rd Edition / Revised and Updated" but I'm not plugging the book but leading you to an article Learning about Exposure ~ The Exposure Triangle by Darren Rowse at Digital Photography School which references the book.
How often do you review?