The 7th house in Astrology holds the Status of one the most important houses in Astrology. I personally say it “The Door of Happiness”.
Strong 5th house would indicate prosperity after marriage
According to Satyacharya, the lord of the Rasis (Signs) falling in the 2nd, 4th, 5th, 8th, 9th and 12th from the Mulatrikona of a Graha (Planet) are friendly to that Graha.
There are Groups of planets which go good with each other and then there are planets which shows clashes.