General influence of aspects of planets is as below:
Sun: Carries the self and ego to the aspected sign. It gives dominating energy upon the planet, sign or the house. It Doesn’t hesitate to give quick direction.
Moon: Moon carries its nourishing energies with it to the house it aspects. An emotional & mental energy.
Mercury: Aspect of Mercury & its energy waves gives direction to the point one seeks to communication, information, research.
Venus: Carries its energies of desire to focus and find comfort and happiness from.
Mars: Mars carries heat with aggressive action energy in its aspect. The house generates action.
Jupiter: Jupiter carries its energy of our internal direction from the point where we desire to grow and acquire knowledge. It is for physical as well as religious life.
Saturn: Saturn carries its limiting, restricting and separating energies with it in its aspect. Just like a strict teacher its energy influences and purgates the bad contents our consciousness and thus the power of focus increasing responsibility.
Rahu and Ketu (North and South Nodes of Moon) are shadow planets as they do not have any physical bodies. Their aspect are very important in astrology for understanding the past life karmas and things to be fulfilled and transformed in the current life of a native and overall transformation. Some treaties say that these two planets aspect 7th house from their position and 5th and 9th aspects are also considered. While some say that they do not have any other aspects except only 7th house aspects and that they do not have any 7th aspect to each other.
As per my experience, Rahu and Ketu have extremely important and powerful 7th aspect on each other (as one cannot function separately and carry out its assigned activities without help of other) and apart from this, Rahu has 5th and 9th aspects and Ketu has 5th, 9th as well as 12th aspect.
Further point to be noted is that if a Planet weather a Natural Benefice or Natural Malefic aspect its own sign then it results in happiness and prosperity according to that house and Karaka of the planet.
Secondly, energies of aspects may differ due to its ownership of particular house, placement of the planet in a particular house, its strength and conjunction.
Thirdly, the aspect of planet in analysis attaints more significance if its own main period (Maha Dasha) or sub period (antar dasha) is in activation.
So, above points need to be kept in mind before coming to any conclusion.
Click on the below Icons to know more about the aspects of planet at different houses and their effects: