In this lesson, Miss Gafa continues to explain the topic of number systems, specifically focusing on binary numbers and binary addition. She emphasizes the importance of memorizing addition rules, such as zero plus zero equals zero and one plus one equals zero with a carry of one. The lesson progresses into performing binary addition with examples using a five-bit register and comparing binary numbers to their decimal equivalents. Miss Gafa encourages students to practice these rules thoroughly as they will be essential for solving problems involving binary addition.