The Rashi lordships of the Grahas play a key role in the interpretation of the birth chart. It is very important to thoroughly understand its principles. Usually a birth chart report tells us about a planet and its significance in a sign and in a particular house but a birth chart report fails to analyse that each Rashi (sign) has a planetary ruler.
We have also seen that each Rashi corresponds to a bhava (house). Whatever is the ruler of the Rashi, becomes the ruler of the corresponding house. Since most Grahas rule two Rashis, most Grahas will rule two houses.
For example, Karka (Cancer) is ruled by Chandra (Moon). In your chart, Karka is in the 10th h., therefore, Chandra is the ruler of the 10th h.. Chandra only rules one sign, so that is the only house rulership it gets. Kumbha (Aquarius) is ruled by Shani (Saturn). Kumbha is in the 5th h.. Therefore, Shani is the ruler of the 5th h. in your chart. But Shani also rules Makara (Capricorn), which is in your 4th house. Therefore, Shani rules two houses, the 4th house, and the 5th house.
The ruler of the house fully represents the house. Wherever the house ruler is placed, it will cause an effect according to the nature of the one or two houses it rules. In your chart, Shani is in the 1st house, so it will carry the influence from the 4th house and 5th house to the 1st house. Even though we said that the house is fully represented by the ruler, the way the influence is delivered varies greatly dependant on the Graha that is the ruler.
The actual effects of the Graha are a mix of it’s own characteristics and of the house(s) it rules. Each Graha has a Mooltrikona sign, its “root” sign. If it rules two Rashis, it will more predominantly rule the Mooltrikona sign. Out of the two houses it may rule, the one corresponding to it’s Mooltrikona sign will be represented more predominantly. For example, the Mooltrikona sign of Shukra (Venus) is Tula (libra). The other Rashi ruled by Shukra is Vrishabha (Taurus). The house corresponding to Tula, 1st house, will be more represented by Shukra than the one Vrishabha is in, 8th house.
The Grahas not only represent the houses they rule by influencing the houses occupied, but also the other direction: a Graha fully represents a house and any influence on that Graha is interpreted as if it is on the house itself. For example, Budha (Mercury), rules the 9th house and 12th house in your chart, and is placed in the 11th house. Therefore, the areas of life represented by 9th house and 12th house get the influence of the qualities of the 11th house.
An additional, more advanced interpretive principle is also applied. The distance of the house to the position of it’s lord is important.
For example, the lord of your 7th house is in house 1. That is 7 houses away from the 7th house. The principle here is that every house can be considered as the starting point, the lagna, for the areas of life it represents. If your 7th house is considered as the lagna (the lagna of the spouse), the lord of the 7th is in house 7. The interpretations that you derive that way are relevant for the area of life represented by that house. The interpretation of the house placement as counted from your own lagna is more relevant for you.
In other words, using the house in question as the lagna, you take a step away from your point of orientation, towards the perspective of the person or area of life represented by the house. This principle will be illustrated in the comments on Parashara’s lordship interpretations. Parashara gives interpretations for each and every lordship combination. It is a very good exercise to study those and find the underlying logics used.