Here are some examples:
Masculine:
* Le livre (the book)
* Un chat (a cat)
* Beau (beautiful - masculine)
Feminine:
* La table (the table)
* Une chaise (a chair)
* Belle (beautiful - feminine)
It's important to note that gender does not always correspond to biological sex in French. For example, the word "table" is feminine, even though it is not a living thing.
This grammatical feature can sometimes be confusing for learners, but it's a fundamental part of the French language.