Classical music has three very broad periods:
Common practice music has several periods (having different language traits):
The books below mostly focus on classical and romantic periods. They give an intro into music notation and are good for a beginner, although they ultimately go pretty far into things like voice-leading in four-part writing, diatonic and chromatic harmony (from Roman numerals to Neapolitan sixth and augmented sixth chords) and overview of forms (sentence, period, binary form, sonata form). They will probably take a good year or two to study. Their core topics are the same, so the difference is primarily in the choice of examples, notation, terms, exercises and appendices.
Also, there are advanced materials
Also, let’s see what we have for a specific example: Beethoven op. 10 no. 1 mov. 1


(Comparison of books is taken from a review by Brad Osborn)
On the openness of harmonic analysis


https://www.youtube.com/@auralskillsguru
Hrvoje Staneković. Musical harmony, theory with examples from piano repertoire – Several harmonic analyses of piano scores of Bach and Chopin with a very thorough introduction
Frans Absil. Musical Analysis: Visiting the Great Composers - A lot of classical pieces from Bach to Shostakovich are analysed bar-by-bar

