How do I read a dragon's page: its stats and troop capacity?

On a dragon's page, two key figures at the bottom of the card:

• 🔥 Power: the dragon's raw contribution (e.g. 17,540 → 25,620). Mostly tied to its level. A fine sorting criterion, but cross-check it against the abilities it has unlocked.
• Troop capacity (e.g. ~5,000-6,090): that's the dragon's fuel and durability. With 3 dragons at ~5,000 you're fielding about 15,000 troops.

Higher up you'll see the 4 combat stats: Strength, Instinct, Intelligence, Initiative (they rise with Reign Level and stars).

Beginner tip: always fill troops to the max, but never pick a dragon just for a big troop capacity. Pick it for its abilities and effects.