It required a great deal of research for me to understand the strategies to develop into a much better player. Occasionally, I have focused on Madden NFL-specific tutorials, primarily on YouTube. However, I also started reading books and websites about real-life teams and their strategies: Take Your Eye Off the Ball from Pat Kirwin, by way of example, gave me a deeper understanding of why teams select certain plays in given situations, and why they work against specific defensive policy.
I recognized that my main flaw was in defensive play. While I am generally able to move the ball down the field in many issues from the computer, I relied upon guesswork when picking defensive heroes -- and while you can just about get away with this from artificial intelligence, it is not possible to play this way against an internet opponent, who can read everything you're doing and make adjustments to strike it.
My mindset was this: if I can understand my defense better, then I'll also know its strengths and weaknesses, meaning once I come to play offense I'll understand how to harness my opponent. So I set to work on attempting to garner a simple comprehension of formations; I learned to stack the box in 3-4 or 4-3 formation when anticipating a jog, and also to work in Nickel or Dime when the opponent is very likely to throw the ball -- perhaps on a second down or third down play.