Conference notes fail differently from lecture notes.
At a lecture you will be examined, the material is structured, and you know why you are there. At a conference you attend twenty loosely related sessions, half of which turn out to be sales pitches, while the genuinely valuable material happens in a corridor with someone whose name you did not catch.
Notes taken as though it were a lecture produce forty pages nobody reopens.
Decide what you came for
Before the first session, write one line at the front of the notebook: what would make this trip worth it.
Two hires. A decision on whether to adopt a technology. Three people worth knowing. Understanding why a competitor is doing something.
This is not a motivational exercise. It is a filter, and without it you will take uniformly detailed notes on everything, which means uniformly useless ones. With it, most of what you hear is correctly ignorable, and the small amount that is not becomes obvious. If a talk is not serving the line, stop writing and just listen.
During a talk
The slides will be published. Whatever you write that duplicates them is wasted, and this is the single biggest change from student habits. You are not there to record the content. You are there to record your reaction to it.
Capture four things.
The claim you disagree with. Speakers state things confidently that are not obviously true. Your objection is worth more than their bullet point, and you will not remember it in an hour.
The thing that surprised you. Surprise means it contradicted a model you were holding, which makes it the most informative moment in the session. Mark it heavily.
The one number. Talks contain many numbers and one that matters. Market size, error rate, headcount, cost. Write it with its source and date, because it is the thing you will want to quote and the thing you will misremember.
What you now have to do. Anything that turns into an action goes in a running list, marked distinctly. Deciding the next step at the moment the thought arrives is what stops it circling for the rest of the day, which is the Zeigarnik effect finding and the core of Getting Things Done.
Keep them visually separate. One column for the talk, one for you. The Cornell method is close to ideal here for exactly that reason, and it also leaves the space you will need for the evening pass.
Between talks is where the value is
The corridor conversations are the reason to attend in person, and they are the least likely to be captured, because writing during them is rude and afterwards you are already in the next one.
Capture in the sixty seconds after a conversation ends. Name, what they do, the specific thing worth remembering, and whether you owe them anything. This is the highest-value note of the whole conference and it has a very short shelf life.
Photograph the badge or the card, then write next to it. A photograph alone is a name you will not place in three weeks.
Note what you promised. "I will send you that paper" is a commitment. It is also the follow-up that is remembered when everyone else's is not.
This is the argument for capture friction mattering more than structure. If catching a name takes unlocking a phone, finding an app and choosing a folder, you will not do it while someone is walking away. See the capture habit and how to capture a note.
The last evening
Twenty minutes, before you travel home. This is the step that decides whether the trip produced anything.
Write the three things you will actually change. Not what you learned, what you will do. Three is the honest number; a list of fifteen is a list of zero.
Extract every commitment into a real task list, with the person's name attached.
Write down who to contact and why, while you still remember which conversation was which.
Then close the notebook and do not process the rest. The forty pages of session notes are archive. They are searchable, they are done, and going back through them systematically is a project you will not complete. See how to declutter your notes.
The reason to do this on the last evening rather than the following Monday is that the decay is steep. By Monday you have the pages and not the context, and the context was the valuable half. Even one spaced pass shortly after is worth more than a thorough one much later, which is the practical shape of the forgetting curve.
Practical notes on tooling
Phone beats laptop in a session room. A laptop is a screen between you and the talk, and it drifts to email within ten minutes. If you type fast, that speed is not helping you here anyway, because verbatim capture is the failure mode: see handwriting vs typing notes.
Photograph slides rather than copying them. One photo, then back to writing your reaction. A photo of a slide is not a note, and should not be mistaken for one.
Record talks only where recording is permitted, and check, because many conferences prohibit it and some speakers are presenting unpublished work. If you do, treat the recording as a backup rather than the notes: see how to take notes with AI.
One note per day, not per session. Twenty session notes are twenty orphans. A single dated note per day, with headings, keeps the context together and makes the evening pass possible. See daily notes.
The short version
Write one line about why you are there. In talks, capture your objections, surprises, one number, and actions, not the slides. After conversations, capture the person within a minute. On the last evening, extract three changes and every commitment, then stop.
Everything else is archive, and archive is fine.
More in how to take meeting notes, how to take interview notes, and how to review your notes.