This lecture covers the fundamental concepts of operators and expressions in the C programming language. It begins by introducing the basic operators available in C, including arithmetic operators such as addition, subtraction, multiplication, and division. The instructor emphasizes the differences between integer and real number divisions, highlighting potential pitfalls when performing these operations. The lecture also discusses comparison operators and the importance of distinguishing between assignment and equality testing. Logical expressions are explained, noting that any non-zero value is considered true, while zero is false. The instructor warns against common mistakes, particularly the confusion between assignment and equality operators. Additionally, the lecture touches on the comma operator, explaining its evaluation process and potential for confusion in expressions. Throughout the lecture, the instructor draws parallels to Java, providing context for those familiar with that language. The session concludes with a reminder to prioritize clarity in coding practices, ensuring that code is understandable for future reference.