What method can you use to add notes or memos to transactions in QuickBooks Online?

Using the "Memo" field to add notes or memos to transactions in QuickBooks Online is the most efficient and integrated method. This feature allows you to include specific comments or reminders related to that particular transaction directly within QuickBooks. It keeps all relevant information in one place, making it easy to reference later.

The other methods do not integrate directly into QuickBooks and can lead to disorganization. Sending an email to yourself might help in remembering details but does not associate the note directly with the transaction in the software. Making a separate document could also work for note-taking but creates additional administrative work and requires manual effort to track back to the different transactions in QuickBooks. Posting on social media is unrelated to transaction management and does not serve any functional purpose in this context. Thus, using the "Memo" field stands out as the best choice for effective note-taking within the platform.