The main and key chart is the natal and transit chart which shows your life evolution and that evolution from your perspective too. 

Looking at the planets’ position and the aspects they make to the natal planets, you can understand what is happening in your life. You have to look at the aspect that the transiting planets make to the natal planets but also the aspect that the natal planet makes to the transiting planet. And you also have to look at the aspect that the transiting planets make to the other transiting planets (the “celestial state” of the planets). The aspect formed by the personal planets will show what you are likely to do based on your own personal tendencies derived from who you are, from your own personality. The aspect formed by the transpersonal planets will give indications of what is likely to happen with regards to you and your life.

You also have the natal and solar arc chart which is concerned with the External Circumstance from what I call “the outside word”, the world out there which will impact your life and bring about events.