Start with recording where the notes are being taken from.
Identify a time to go back and review your notes.
Are there any aspects that are confusing? Do you need to follow-up on any questions? Are there further areas to research?
Note taking is not all about re-writing every work spoken or written. Your note taking techniques will vary depending on why you are taking notes. For example:
Depending on what information you are recording will influence if your notes are structured or not.
If you are recording course requirements and guidelines, it might be unstructured notes that you record, perhaps in a workbook for your class. However, if you are doing a literature review, you might start to classify your notes so that you can easily find them in the future.
If you are taking notes, then you need to provide time to go back and read them.
While reading, reflect and create connections between the knowledge that you currently have and also what you are trying to discover. Are there any connections that you can make with your previous notes? Are there any questions that arise as a result of re-reading your notes. Are there any ideas that you have to clarify or investigate? Are there any action items that come our of your notes?
Make time to read and review regularly. Improve your notes, convert them into your thoughts and conclusions or archive them if you no-longer need them.
If you are processing notes from reading through research papers, take the time to properly cite and reference the document that you were using. Do this at the start of your research process rather than at the end.