One approach is to pick your favorite coin type and learn all the high points on the coin then study photograde for that series from poor to MS70. When you see posted coins for that series here then attempt to grade it within 10 points. Then go to photograde and try to match it to the closest photo. See how close you were with your initial assessment. No cheating looking at everyone else's post until you narrow it down. Once you are comfortable with that series move on to another one. After a couple months you will see significant improvement in your grading abilities. A great site for learning grading and coin high points go to coingrading.com and select how to grade coins. Then select grading other series. Each series is listed showing the areas that will wear first. There are also great articles on grading there.