We've had some cheating scandals in the MTG community during the last few weeks. Some of the most high-profile ones were obviously intentional, but sometimes we find ourselves cheating without even meaning to do so. Be it playing an extra land, attacking with a freshly summoned creature, or missing a trigger of some sort, we've all violated a game rule at some point. These GRVs can result in warnings, game losses, or even disqualification from events, which is especially painful when they arose due to a legitimate misunderstanding or memory issue.
To help with this problem, Gathering Magic's A.E. Marling wrote a great piece called "Foolproof Magic." In it, he addresses small things you can do to ensure you don't inadvertently violate a game rule. For example, do you have trouble remembering if you made a land drop earlier in a turn? Marling suggests (with photos to illustrate) that you play your lands upside down (then turn them upright during your next untap step).
This article is great. It addresses common problems such as playing extra lands, tapping mana correctly, forgetting upkeep triggers or other triggered abilities, and more. Each tip and trick is illustrated with a photo so that there's no mistaking exactly what Marling is talking about. If you're looking for easy ways to track information so you can focus on the actual strategy of your games, this is definitely an article to check out.