I generally dislike “N [noun]s of [adverb] [adjective] people” articles, but this particular piece of advice from Jeff Haden stands out:
They “close” genuinely.
“Nice to meet you,” you say, nodding once as you part. That’s the standard move, one that is instantly forgettable.
Instead go back to the beginning. Shake hands again. Use your free hand to gently touch the other person’s forearm or shoulder. Say, “I am really glad I met you.” Or say, “You know, I really enjoyed talking with you.” Smile: Not that insincere salesperson smile that goes with, “Have a nice day!” but a genuine, appreciative smile.
Making a great first impression is important, but so is making a great last impression.