Not much in common: Very incompatible, not much understanding
Aries with Capricorn
This is a very difficult pairing to make work as there are many fundamental differences in personality between these two sign. Aries is fast-thinking and fast-acting and rather rash and impetuous, while Capricorn is basically the opposite, they are very cautious and think very carefully about their actions before committing to them.
Aries is too impulsive for cautious Capricorn. Aries may soon view Capricorn as too calculating and cold, with Aries trying hard to get a reaction, any reaction from Capricorn, who view Aries as inconsiderate and brash.
There are also differences in the way they spend and save money - Aries is too extravagant for penny-pinching Capricorn. The only area they may have compatibility is sex - Aries appreciates a lover who has a lot of stamina, which Capricorn has in abundance, but this isn't enough to sustain a relationship long-term.