From: Utlima Thule
ok, I'll do the best I can but the problem is it is a lot of trial and error, not least everyone has variants that they use.
TF - task force (your naval units)
Land combat, you mostly need to be methodical with the allies but you can't win by attrition. A quirk that you need to use is that the Germans often need to defend by brigade - these are often tough but fragile. Hit a brigade with 6 divisions and it will suffer badly.
Now to optimise your ground units, watch out for fatigue - this drops your efficiency horribly and watch out for missing trucks (ditto), trucks go missing when they need to go a long way to gain supply. My best advice here is to grab the 1944 scenarios - Breakout or Market Garden - and work with them. Even a few turns, try variants of HQ supply level/depot priority (Market Garden is excellent for this). The idea in the end is to come upo with something you have an intuitive feel for.
Strategic airwar. Again the scenarios are your friends. Try things out its not as much a time investment as the campaign. Use the RAF for night bombing, escort with your night fighters. Stay in OBOE range (check the manual on this). If you are (as you should) bombing manpower and HI the standard load out of some heavy bombs and incendiaries is good. If you are going for the U-Boats around Hamburg swap to heavy bombs.
For the USAAF, think more creatively about your fighters, yes you need close escorts but putting some (and the RAF Fighter Command can help here) onto air superiority can really hurt the Luftwaffe. Your B-17s are your work horses, the B-24s (and the Liberators) are useful for secondary raids where you are hoping there are few fighters - both have a good long range, so use them for targets deeper into the Reich.
For tactical air, practice with the break out scenario, honest, just practice. Set yourself goals/tests. Can you get a pattern of #7-9 interdiction over the axis forces facing the Americans? No, do it again till you can, think about plane allocations, air directives, weapon load outs. Use your 2 engined bombers to directly attack the German front line. Keep a decent batch back for ground support. Whats a decent batch? No idea, I change my own mind every game I play.
But thats how I learnt, and in the end have my own understanding. Someone like Q-Ball is much more analytic, I'm pragmatic in my approach.
But this is more advice working from your goals back to the details, I'm not sure there is much of a detailed recipe book.
Beyond this have a look at the AARs. Especially some of the older ones have T1 strategic air discussions that are highly detailed. Now game rule changes may have invalidated some of that but at least its a starting point.