There is no need to study in Liuzhou, and there will be no one to teach in general training schools now. The easiest way is to learn online:

Copy "Basic Knowledge of Music Theory" and paste it into the address bar to search.

The search results will appear as shown in the figure:

Click on the search results to see which one is most helpful to your study. Save it as a favorite or right-click and copy and paste it to your desktop.