The ranked mode has 3 main ways to play, Left attack, right attacker, and Eco(Money/Economy) This will show detailed strategies for each, however if you want a short version then that will be found here:

Eco: For eco the strat is to get the farm in front, then farms in back, then upgrade all those to pumps. After that getting a harbor is required in order to get gold mine island and rigs. They also want to attack other rigs that the enemy is getting.

Left: The left attacker wants to get the farm to the left, then the other farm a little more left. One getting that they want to make a base near the gold mines in the middle. They want to control mid and push through to the enemie's back island, damaging their eco.

Right: The right attacker moves to the right farm, then gets the two farms to the right. Then they will push to mid and get a base there and try to control mid, the right attack will be defending mid while the left attacker pushes. After all this both attackers want to push through to the core.