This is so helpful. Thanks to everyone.
The more stuff there is to analyze, the more I like astrology. I guess that makes me naturally more interested in modern. I know traditional astrology does not recognize everything that modern astrology does.
Is there a way to learn both in a way that doesn't cloud a person's objectivity of a chart? Are there people that look at charts using both to see which one paints the most accurate picture or to see how many similarities can be found using both?
I don't see a problem in blending the two systems: today there are more "hybrid" astrologers. It's just that it's a lot to learn at once. I think the best advice is to start with modern, because it is analogous to learning to drive a car with automatic transmission before learning a stick shift. But some people quickly discover a preference for one or the other-- or Vedic (jyotish.)
Although modern astrology does have its share of modern techniques, not just "more stuff" (harmonics, minor aspects, midpoint pictures, horoscope patterns, Sabian symbols, &c) these methods are best introduced at a more advanced level.
A good textbook on traditional astrology that assumes no prior astrological knowledge is Avelar and Ribeiro,
On the Heavenly Spheres. I picked up this book after years of studying modern astrology and was pleased that I already knew about 1/3 of the material simply because the two systems overlap. An interesting hybrid sort of book is Demetra George,
Astrology and the Authentic Self. Also, some authors translate ancient concepts into modern idioms, such as Stephen Arroyo's book,
Astrology, Psychology, and the Four Elements.
Astrology appeals to people who are fascinated by complex systems. While linear thinkers sternly warn against too many data bytes, some of us say, "Bring it on!" However, it is really helpful to work with a kind of rubric or protocol.
There are different diagnostic systems to follow, such as starting with the basic sun-moon-ascendant triad before moving on.
I think it helps to consider astrology like a grammar or sentence structure.
planet: the subject of the sentence. Your emotions (moon.) Your sense of self (sun.) &c.
sign: how or in what manner a planet operates (like an adjective or adverb) Here the elements and qualities come into play.
house: where or in what domain of life a planet operates (like a prepositional phrase)
aspect: how or in what manner two or more planets function with one another. (harmoniously, stressfully, &c)
So if you find a placement like the sun in Taurus square Mars in Leo, you might read it as, "His persistent and practical sense of identity is constantly goaded by his more authoritarian confrontational side."