I buy first the Restoration tech because
We can built the lift and then remove the rubble for the cave entrance. But the lift is important for as we could plant the fruits
I next buy the medicine lev.2 and science lev.2 the buy the faction to lev.2
Because then we can tame the sharks and have fishing ( unlimited food source )
The magic faction would raise the scientist productivity and the max population. But I heard that many buy the nature faction 'cause of replenishment of food sources more quickly and it extends longevity.