I usually focus most on the structure of the natal chart when reading it, but I find it difficult for me to analyze a natal chart with a stellium. Cuz most of the 7 planets are in one sign and it's very likely that they are in conjunction and even there's reception/mutual reception in them, I usually have few clue for analysis of the natal chart. I wonder the approach/method for analysis of natal charts with stellium.

you might be interested in this... it's a great question and i don't have time to give you a proper reply... i have read this pdf that i am sharing and i encourage you to see about reading it.. welcome to skyscript!

https://www.astro.com/astrology/aa_article140903_e.htm

Hello Aimer,

A stellium is a 'concentration of power' in the house it is found. It joins, blends with, connects, energizes, comes together with, intensifies, increases.
There is a tendency here to put all your eggs in the same basket, for good or bad. Strong stellium people are always looking for 'opportunities' to start on a new path or to be born again.

Here is an interesting article by Sarah Potter
https://www.astrology.com/article/stellium-meaning/

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Morin de Villefranche says in Book XXI of Astrologia Gallica (tr James Holden).

How to proceed when two or more Planets occupy a House

54. The more planets there are physically together in a house, the more this will indicate something extraordinary in terms of the house meanings.
55. When many planets occupy the same house, each operates according to its nature and its own other determinations.
Each one must first be considered according to the rules numbered from 22 to 53.
56. The most powerful action on the house significations will come from whichever one of the planets is also the house ruler; then, from that one which is in exaltation; and in the third place, from the one possessing the closest natural analogy with the house meanings.
When the dignity and analogy are not found together in the same planet, one must take into consideration the two or three planets together in which these conditions are separately realized.
The fourth place in order of power goes to the planet which is nearest to the house cusp.
57. When, among many planets occupying the same house, some correspond by their analogy to the meanings attached to the house, whereas others are contrary to them, it is necessary to ascertain which of these two groups is the most powerful. If the former, the affairs indicated will be achieved; if the latter, their realization will be impeded or prevented.
58. When the planets occupying the same house are all benefics, they anticipate the fulfillment of the good fortune and the suppression of misfortune indicated by the house. If they are malefics, the contrary will occur, unless they are in good zodiacal state in a favorable house.
If some are benefics, and others malefics, it will be necessary to examine with care which ones of the two groups are the most powerful, and to judge according to the result of this organization.
59. Consider the following:
· If, in a fortunate house, a benefic planet is followed * by another benefic, this indicates that the good produced by the house affairs will be stable.
· If the benefic is followed by a malefic, the fortune acquired will be lost.
· In an unfortunate house, a benefic followed by another benefic indicates that the misfortune will not be realized, or if it is, in an extremely limited way.
· If this benefic is followed by a malefic, however, the misfortune signified by the house will certainly occur, but the native will escape it.
· But if a malefic is followed by another malefic, the misfortunes caused will be very serious and the native will never escape them.

* In the direction of the diurnal movement of the Sphere; the body which precedes is thus the one closest to the cusp, the one which follows is further away. (Note: Thus, the closest to the cusp is the locomotive and the other planets are the trailers)

Blessings,
Ouranos