I'd be wary of that... Coaching is usually a scam, and although I've seen that guy's face in the bitcoin space, its still better avoid anyone offering coaching.

Those star forts are cool, but only as museums. We don't build them anymore because A-10's exist. The only counter to mobility is more mobility.

A wall is just a target. Even if you put cannons on top of the wall, the exact same cannons will win against it if they can move around.

A dragoon beats a swordsman -> swordsman gets a musket and beats the dragoon -> dragoon gets a pistol and easily wins again. A pistol is less powerful, but mobility makes the difference.

A tank beats a trenchman -> trenchman gets liquid metal RPGs and momentarily wins. Then an airplane shows up. Mobility wins.

Finally everyone in the world understood the real game is mobility, and got air forces. So we went higher, got stealth bombers and satellites.

No matter where you go or what your strategy is, if your opponent can move faster and shoot farther, you lose. Half the battle is getting people on board with your plan ; the other half is not getting blown up. There are infinite ways to get blown up ; there's only one way not to - move. Only mobility has ever defined any confrontation. That's why the Mongols beat the Chinese and the Persians. That's why the British navy took a quarter of the whole world.

Its necessary to think in these terms because our opponents think in these terms.