You need something like this: https://www.amazon.com/Alfreds-Essentials-Music-Theory-Self-...
It's not something you're going to learn in an afternoon or a weekend, it's hard work and Beethoven was still working on it at the end of his life.
Last month I spent an evening analyzing and discussing a passage of Rachmaninoff, trying to understand how he knew how to write a certain sequence.
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You need something like this: https://www.amazon.com/Alfreds-Essentials-Music-Theory-Self-...
It's not something you're going to learn in an afternoon or a weekend, it's hard work and Beethoven was still working on it at the end of his life.
Last month I spent an evening analyzing and discussing a passage of Rachmaninoff, trying to understand how he knew how to write a certain sequence.