Cappy Leo and Cassie Luv, hi. Houses are the playgrounds of our chart, the life compartments as it were. They dont really have energy by themselves. The energy is given by the planet that rules the houses, so, like Natasa also said, look at the rulers of the houses, always, notwithstanding whether they have or have no planets in them. But should there also be planets in that house, then there is a stronger focus on everything.
Take for instance the 8th house.
8th house has to do with transformation, joint finances, other people's money, inheritance, sex, life and death situations and generally shows crisis situations which have to be mastered.
It is a very deep house, and indeed has similarities to Scorpio (as being the 8th sign) and Pluto, its modern ruler. But Pluto and planets in Scorpio do not serve as a substitute for an empty 8th house. Planets are energy, houses not.
On the other hand, when you have nothing in the sign Scorpio, planets in the 8th house can indeed give the person an 8th house, Scorpionic if you wish, tone. A Mercury for instance will be thinking deeper, inclined to research. But where Mercury can express that deep thinking will be shown by the ruler of the 8th house.
Now, if you want to know how you would deal with 8th house issues in your life, you look at the ruler of that house. That ruler, in another house (life area) and sign (background colouring) will give you an indication where (house) you will express that planets energy.
Should the ruler falls in the 1st house, it is very much self focussed and you will most likely want to turn things inside out or transform things in order to come to the truth or deeply think about life and death issues;
if it falls in the 7th, you can expect powerstruggles or joint finance dealings with your partner or others in general, in the 5th, your children or you like to turn 8th house type things, like deepsea diving, psychology, the occult into a hobby.(also 5th house). Romance and sex will be mixed most probably.
The ruler of the 8th then also shows you how that energy will be expressed and now you look at the background (in Cancer? in Aquarius? etc.). Lets say that your 8th house is ruled by Venus (Taurus cusp). OK, you find Venus in your 2nd in Scorpio. How does a Venus in Scorpio react do you think? What does the 2nd house mean? (your own money). Conclusion: You will mainly have 8th house issues (power issues, life & death, crisis, research, inheritance etc.) related to 2nd house life situation (your income, your selfconfidence/worth). Extra note: Because we are seeing in a case like this an interaction between the 2nd and 8th house axis, money will play a big role in your life.
Then you also must look at aspects to that 8th house ruler. This shows if you are comfortable with 8th house principles expressed in the 2nd house (trines and sextiles) or not (oppositions, squares and occasional conjunction depending on which planet it conjuncts of course).
Should you then come to the conclusion that your are really uptight about money from what you can deduct, then also look at the Ascendant and it's ruler as well as how that ruler is aspecting that Venus or the 2nd house ruler. Maybe there are no aspects to Venus, maybe yes.
The Ascendant sign can help or hinder this placement also. Maybe a Libra Asc. will try to find a balance when needed, but if Ascendant is also Scorpio, then the money issues will reflect on you personally as well. (1st and 2nd house are then connected).
It is a lot to take in, but it is a systematic deduction and does give you some idea on how to approach empty houses.
Cheers, Starlink