Alright, here's something a little different.
Most new players think the fastest way to win is to build the biggest army as quickly as possible. I used to play that way too, until I started reading about Chinese military strategy.
One thing became obvious pretty quickly: their way of thinking is completely different.
Instead of asking, "How do I win this battle?" they ask, "How do I make sure the battle is already decided before it starts?"

That mindset actually fits War Era surprisingly well.
Take production, for example. A lot of players spend everything on units the moment they have enough resources. It feels good because your military score goes up, but six hours later you're broke and waiting for materials.
A different approach is to invest in your economy first.
Steel, concrete, fuel, electronics... they may not look exciting, but every tank, aircraft or missile you'll build later depends on them. If your economy is stronger than your opponent's, time starts working for you instead of against you.
Another thing I noticed is patience.
In many games people attack simply because they can. Sometimes they capture a province that isn't even important, lose half their army, and end up weaker than before.
Chinese military thinking puts a lot of value on choosing the right moment. If an attack doesn't improve your position, why make it? Waiting isn't always passive. Sometimes waiting is the move that wins the war.
Information matters just as much.
Before opening another front, spend a few minutes checking your neighbors. Who is online? Who is already fighting someone else? Who has stopped producing? Small details often tell you more than military strength alone.
The best opportunities usually appear when someone else makes a mistake.
Logistics are another thing many players underestimate.
There's no point building a massive army if your production can't replace losses. Every battle costs resources. If you can't recover while your enemy can, you'll slowly lose even if you win the first few fights.
One principle I like is to avoid unnecessary wars.
Not every country on the map has to become your enemy. A reliable trade partner or a neutral neighbor can be worth more than another conquered province. Expanding too fast often creates more problems than advantages.

In the end, Chinese military doctrine isn't really about being defensive or offensive.
It's about putting yourself in a position where your opponent has fewer and fewer good options.
When that happens, the outcome usually takes care of itself.
War Era rewards players who think ahead. Building the right economy, choosing the right targets and knowing when not to fight can be far more powerful than simply producing the biggest army on day one.
Sometimes the strongest move is the one your opponent doesn't even notice until it's too late.