Avoiding mistakes. Pretty broad topic, huh? If only it were as easy as reading one article to ensure you’d never make a mistake again.
Unfortunately, it won’t be quite that easy. The best I can do is prepare you for the spots where you’re likely to run into problems. Going the extra mile in key situations will help you avoid those problems.
No particular mistake matters in the long run. I could tell you, “Hey dummy, you shouldn’t have attacked your 2/2 into that 2/2 first strike.” But you probably already know that by the time your creature hits the graveyard. Instead, the important question is – what led to the mistake? What were the circumstances in which this was allowed to happen? And what can you change to lower the chances of something similar happening in the future.