This is a tricky one to explain as instructors often don't understand what I mean by this.
What I do NOT mean is to listen to student's technical questions and help them by doing the assignment for them. Troubleshooting your their bug or issue is not what you should focus on. If a student comes to you and says he/she is struggling, you should
Note that actually helping students by taking their keyboard and typing on their behalf is not the right solution. In fact, when you're helping students 99% of that should be through whiteboard and very very rarely, you will actually have to type a single thing. You're there to learn, gather data, learn how to teach things better, and get feedback directly from the students whether your curriculum is really helping. You're not there to do their assignments.
Important - note that in the video, I also explain how to conduct live classes and lead help sessions, in a way where you're not troubleshooting bugs directly for the students but how to increase collaboration and learning outcomes for all students whenever students approach you for help or are stuck. I strongly recommend that you re-watch this video when you're doing the live class to see if you're employing the help session techniques I mention in the video.