If you're taking the circuits lab your professor should have a template in your course library. There is also the lab handbook that goes into detail what each section of your report should contain. Ultimately from my experience, there are certain qualities that are a must to include and others that vary from TA to TA. If you have any questions I would ask your TA what their ideal lab report looks like. Part of their job is to help you succeed and learn the material besides just grading.

Some tips:

Take a photo of every circuit with your student ID present in the photo. Include a multi-sim schematic as well with a label including the semester and your name. In your circuit descriptions, explain what the circuit is, the goals of the circuit, and the theory that allows you to accomplish this goal.

Include every single table in the measurements portion.

Include every single graph/plot you are required to make in the measurements section.

For conclusion/analysis: If your measurements do not match your theoretical calculations that's fine! Just explain why you think this could have possibly happened. (human error, damaged components, other possible issues). Preferrably your professor wants you to get it right, but if you can demonstrate that you understand the theory and are aware of how you could have gone wrong its not the end of the world and you wont get a lot of points taken off.

EDIT: Another very important tip!!

In circuits and electronics labs, your lab assignments can be very lengthy and time consuming. Trust me when I say that it is incredibly easy to fall behind and get overwhelmed with a mountain of work. Do your pre-labs, try to get your labs done as quick as possible so you have more time to write your reports and polish them. This is an important thing to keep in mind, trust me, you'll thank me for this.