My advice to people that read this is;
1. Just as much as attacking is an artform so too is the defense. I implore you to not get stuck on the linear defense North to South in single line. Experiment with different defenses. BY ALL MEANS, LEARN WHERE RETREATS WILL GO TO. I can't stress that enough and I have mentioned it on more than one occasion.
2. In defense, what I mentioned in my last AAR(defense of the Soviet union begins one hex west of Pskov) playing the Soviets, you have to be set up a turn or two in advance in anticipation of where the Germans could be going. You have to get inside the German head if you will. You don't want to find yourself reacting to the German moves and being fatigued, without forts, with your azz hanging out.
3. Playing Germany is all above doing the most with the least. Plan out your attacks. I still do Recon, take a snapshot of that recon then print it out and plan out my attacks with Germany. Yes it is tedious but it has worked for me very very very well. Germany Recon is so good you will rarely miss a unit. In the beginning of the game the Soviets can only have so much defense in a hex. (yes there is a number you can go by as a rule of thumb) Thus if you have the required str you can pretty much make retreat anything in your way when attacking. What really hurts this is the next number.
4. Use your aircraft as Soviets for defense. Yes you are going to lose a TON of them. But it causes good casualties, changes the odds greatly making combat guessing for the Germans.
5. As a Soviet player Recon. If you don't know where the Germans are how can you defend against it? What good is it to save recon planes for later when they should be used now? Granted the Soviet recon is as bad as groping in the dark with your hands..... But you never know when you grab the naked ladies chest

(or a guys chest if you are a lady)
6. Prepare your advance as Germany of where you are going and if hitting a snag where you are going to. Don't needlessly bumble in the night without direction. Because you only have a small window of opportunity and if you don't make it through that window you will hit the wall.
7. Set up reserve activation for both sides on this. I do with the Germans.
The list can go on and on but these are some of the key issues.
****This isn't directed at anyone & only posted here to give newer players ideas to think about on both sides. By all means I'm not a great player since there are many on this forum that have been and are better than I. I only try and help those that wish to take what little knowledge I have