University Circuit and Analysis is an important basic course, and there are some difficult knowledge points that we need to study and master seriously. Here are some knowledge points that may be difficult:

1. Basic concepts: The basic concepts of the circuit include current, voltage, resistance, etc. These concepts are the basis of understanding circuits. In the process of learning, we need to master the definition and nature of these basic concepts.

2. Ohm's Law: Ohm's Law is one of the most basic laws in circuit analysis, which describes the relationship among current, voltage and resistance. When studying ohm's law, we need to understand its mathematical expression and be able to apply it to solve practical problems.

3. Series circuit and parallel circuit: Series circuit and parallel circuit are two common connection modes in the circuit. When learning these two connection methods, we need to master their characteristics and calculation methods.

4. Thevenin Theorem and Norton Theorem: Thevenin Theorem and Norton Theorem are very important theorems in circuit analysis, which can be used to simplify the solution process of complex circuits. When studying these two theorems, we need to understand their basic principles and be able to skillfully use them to solve problems.

5. AC circuit analysis: AC circuit analysis is an important part of the circuit and analysis course. When learning AC circuit analysis, you need to master the basic concepts of AC, complex representation and phasor diagram.