Where does the dictionary explain the abbreviations that it uses?

Answer 1

There are (obviously) many different dictionaries, and they are not all organized the same way. But I would suggest that you open up your dictionary to the first page and see what it is - perhaps a table of contents, which you can find the relevant section. If you don't immediately see a table of contents, just flip through it, from the beginning, until you find something that seems to be helpful.

Answer 2

The dictionary typically provides a key or legend at the beginning or end of the book that explains the abbreviations used throughout the text. Additionally, some dictionaries include the explanation of abbreviations on the inside cover or within the introductory pages. It's always best to check the front or back of the dictionary for a guide to these abbreviations.