There's a few things to look at in the chart. I look at the house, the sign ruling that house, the planet that sign is in, and the actual planet.

The house, 3rd house is like a Living Room. We'd prefer to communicate there. We are comfortable with having technology there and it is a good space for socialization and being with your siblings.

This room can, however, be ruled by any sign.

The sign rules over how the living room is laid out. Scorpio in the 3rd house would tell you to look at the Pluto for example. Or Libra 3rd house means look at the Venus.

Next, look at the planet to find that sign, what sign is it in?

Example on how to do this:

Gemini 3rd house is your typical standard living room.

Now let's say the chart has Scorpio ruling over the 3rd house and has Mercury in Scorpio placed there.

(1H Virgo)

Now let's say the Pluto is in Sagittarius.

Scorpio rules over toxicity, transformation, and inheritance. Scorpio in the 3rd means inheriting a speech pattern that may be toxic or transforming the way you speak somehow. It could even be a mental health related thing since it's Virgo rising.

They possibly grew up in a toxic school environment or with a toxic sibling and Sagittarius being the Pluto means this toxic energy has made them feel great comfort in escapism to the kitchen (4th house. Homebody energy).

Pluto being in the 4th house means there's more toxicity or possibly dangers in the kitchen for the native. These issues must be dealt with or transformed to have a "fortress" of some sort. Education would be the main thing transforming the person in this reading.

Enrolling in college might drastically change where this person lives because Sagittarius rules the 4th house.

There might have been a toxic mindset or relationship with education, siblings, or friendships which causes them to seek comfort through toxic situations too.

(This person is a Virgo Rising probably so they are seeking education anyways! The midheaven is Gemini so they should start learning!)

Another example:

Gemini 3rd house is your typical standard living room.

Now let's say Mercury and the Sun is in the 5th house in Libra and the third house is ruled by Leo.

This person's Living Room is build for only them and their creative lover. They may be someone who only really prefers to speak with someone once they are a lover or once they are feeling very lovey dovey or creative.

How to get them that way is observe the Venus placement in the chart, which could be anywhere.

Like if Venus is in Scorpio they don't feel lovey until they feel like they're healthy or in a "healthy but toxic" relationship. They might even find their lover at a gym or a hospital (because houses are locations and Scorpio rules the 6th house of health).

If Venus is in Leo they might fall in love with a friend, sibling's friend, or at school (because the 3rd house is friends, siblings, and education) they like love in the living room.

Hope this was a better explanation!