The All in one Technology guide!

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Fortifications+Other Technologies
Logistics:
Requires: Level 4 Academy, 4,000 food, 1,600 stone, 24,000 gold.
Rewards: Go to quests, claim your rewards. Every single upgrade allows your troops to carry more resources.
Stockpile:
Requires: Level 6 Academy, Level 1 Warehouse, Lumbering Level 3, 1,200 lumber, 1,000 stone, 800 iron, 2,000 gold.
Rewards: Go to quests, claim your rewards. Every upgrade increases warehouse capacity by 10%.
Construction:
Requires: Level 5 Academy, Level 5 lumbering, Level 2 Metal Casing, 2,000 lumber, 2,000 stone, 2,000 iron, 5,000 gold.
Rewards: Go to quests, claim your rewards. Every upgrade decreases building time of fortified units and normal buildings by 10%. (Roughly around -40 minutes every upgrade with a OK politics hero).
Engineering:
Requires: Level 8 Academy, Level 3 Construction, 2,500 lumber, 3,000 stone, 1,500 iron, 3,000 gold.
Rewards: Go to quests, claim your rewards. Every single upgrade increases of walls and fortified units by 10%.
Machinery:
Requires: Level 9 Academy, Level 4 Metal Casing, 600 lumber, 700 stone, 800 iron, 5,500 gold.
Rewards: Go to quests, claim your rewards. Every single upgrade enhances repair rate of fortified units by 100% (Base is 3%).