I really recommend Margaret Hone's book. It's classical, basic astrology. I learned to calculate aspects and draw charts by hand. That's real fun. All other forms, esoteric, Jungian, Uranian, Magi, Sidereal, Synodic what have you - you need to learn terminology and technique first.
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Sgns-in-planet are not as important as planetary symbolisms, aspects, and planetary geometry. When a constellation is traveling, you have no real mathematical calculation. Planets make aspects (mathematical angles) with each other, then create a geometric shape in an imaginary wheel creates more energy. A lot of people will fall into the Forer's Effect of agreeing with whatever interpretation or believe their signs-in-planet doesn't really fit them. If the person is in the latter category, they are more likely to identify with interpretations from aspects and planetary geometry. Plus charts are as dynamic as the person. So many different ways to interpret a chart based on the native's (the person getting the reading) situation in life. Astrology is like a never ending study haha. Love it.
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Sgns-in-planet are not as important as planetary symbolisms, aspects, and planetary geometry. When a constellation is traveling, you have no real mathematical calculation. Planets make aspects (mathematical angles) with each other, then create a geometric shape in an imaginary wheel creates more energy. A lot of people will fall into the Forer's Effect of agreeing with whatever interpretation or believe their signs-in-planet doesn't really fit them. If the person is in the latter category, they are more likely to identify with interpretations from aspects and planetary geometry. Plus charts are as dynamic as the person. So many different ways to interpret a chart based on the native's (the person getting the reading) situation in life. Astrology is like a never ending study haha. Love it.