The basis of Occultism can be summed up in the word correspondence. James Wasserman
When you start researching hermetics, alchemy, astrology or tarot, you quickly encounter correspondence tables as a method for learning how different systems interact and overlap. Wikipedia defines a correspondence table as:
A table of magical correspondences is a list of magical correspondences between items belonging to different categories, such as correspondences between certain deities, heavenly bodies, plants, perfumes, precious stones, etc.
For example, the 3 zodiacal qualities (cardinal, fixed, mutable) and frequently associated with the 3 alchemical principles (sulfur, salt, mercury) and the 3 "genders" (masculine, feminine, neuter).
Likewise, the 4 elements (fire, water, air, earth) are associated with the 4 suits of the tarot (wands, cups, swords, pentacles) and the 4 alchemical temperaments (choleric, phlegmatic, sanguine, melancholic) and so on.
I decided to digitize as many of these tables as I could find and then relate them to each other in a Notion database. This allows you to explore the relationships between different systems and see how they overlap. There are obviously inconsistencies between different sources, but I think it's still a useful tool for learning. For completeness, I should indicate the different "schools" of correspondences, as different interpretations map the same concepts to different things.
Organizing these ~50 tables took approximately six months of active research and data entry. I'm sure there are many more tables out there, but I think I've captured the most common ones. I've also included a few tables that are not strictly correspondence tables, but are still useful for learning about the occult.
These have helped me significantly in my own studies, and I hope they can help you as well. If you have any suggestions for additional tables, please let me know!
You can navigate the tables on Notion here.
I recommend starting with these these pages: