It is incredibly satisfying to see the damage numbers of your favorite troop increase, knowing it will hit the enemy tower slightly harder.

The level of your King Tower dictates the maximum hitpoints and the damage-per-second of all three of your defensive structures (the two Princess towers and the central King tower).
Hitpoints and Damage Breakpoints
However, if your Princess tower is only level 10, it will deal slightly less damage per shot, requiring FOUR shots to kill that same level 11 Goblin.

This single extra shot changes everything. Should you have almost any concerns regarding where and the way to utilize tower rush, you'll be able to e-mail us with the web page. If a Goblin Barrel lands on your level 10 tower, those goblins will survive significantly longer, resulting in hundreds of extra points of chip damage over the course of the match.
You cannot rely on your towers to clean up mistakes; you must defend everything manually with troops.Spend your excess gold on leveling level 1 cards to level 6.If you activate your King early with a Tornado, a higher-level King provides massive defensive DPS for the rest of the game. The Psychological Advantage
Beyond the raw mathematics, entering a match with a higher King level provides a massive psychological advantage.

This extra margin for error allows you to focus more of your mental energy on tracking elixir and building massive pushes, rather than panicking over minor chip damage.
XP Generation MethodIs it worth it?Upgrading Cards from Lv 1 to Lv 5Extremely High; costs almost no gold and provides a solid chunk of base XPDonating Rare Cards to ClanmatesMaximum Efficiency; provides you with both Gold AND massive Account XP simultaneously The Invisible Shield
It should be an active goal; you should be constantly calculating the fastest, cheapest way to acquire the experience points needed for the next level.

Base health is the ultimate safety net.