Hints:

When playing as the NOD, always have a subterranean APC filled with engineers ready to attack.

The Juggernaut's armor is extremely weak, so always reinforce it with MLR 5 Hover Tanks, which will offer air defenses.

The Deployable Sensor Arrays will detect Limpet Drones, which will prevent the enemy from sneaking them into your base.

Cyborg Reaper:

Build a Cyborg Reaper and send it to the enemy's base. Walk on Tiberium and stay there. The enemy will shoot at it, but the Tiberium will heal it quickly.

Drop Pods:

When fighting the GDI you may hear machine guns firing. This is normal because those sounds were just Drop Pods. The Drop Pods have people in them that have gold stars (which indicates that they are very good).

Disruptor tank:

This is an easy way to get Elite Disruptor Tanks. First, build a few Disruptor Tanks. Then locate a Nod Cyborg Reaper and let all your disruptors fire at once. The Reaper won't stand a chance and all your Disruptor Tanks gain Elite status