Learn the six principles of influence. Cialdini also calls them Weapons of influence. Influencing people was thought as a rare art form but Cialdini breaks it down and teaches everyday people the six strategies to effectively get people to do what you want.

1. Robert Cialdini's
Influence:
The Psychology Of Persuasion
Six Principles of Influence

2. Reciprocity
If you help someone move to another house then
they will feel obligated to return the favor.
People basically hate owing favors but they
understand that they might need help in the
future. Therefore it’s best to return the favor as
soon as possible.

3. Scarcity
Is the basic principle of making people feel like they will lose
out if they don’t act right away. Like many travel booking sites
now will pop up a notification telling you how many people
are looking at your hotel right now. Nothing gives you a more
since of urgency knowing that their is only 10 rooms left but
yet 200 people are currently looking at the same page. It
makes you make a decision really fast.

4. Liking
It is very human nature to only work with people you like. A
good salesperson understands that getting rapport with
prospects is crucial in getting them comfortable in closing the
deal. Try to find similarities between you and the prospect to
build bond. Once connected they will feel much obliged to
work with you

5. Authority
The reality is that many people look up to a leader. If people
feel you are knowledgeable in a particular subject then they
will feel much more confident knowing they can trust what
you say. Seth Godin explains in detail about this phenomena
in his book Tribes. We as humans are attracted to authority
figures and need someone to help explain things to us. Our
brains are always evolving and require a steady stream of
knowledge to help us grow.

6. Social Proof
Humans are social creatures despite what others may perceive. Infact
many of us have rather sheeplike qualities. No one wants to be alone
100% of the time. Even many people are simply lazy and just want to do
anything that works. This is why referrals are so important. If you need a
plumber you can spend hours researching plumbers in the area online.
You spend website after website sorting out reviews and be extra cautious
with the fake ones. So it’s much easier to call you buddy that recently got
some plumbing work done at his house. You ask your buddy if they did a
good job and if they agree than that is all the social PROOF you need.

7. Commitment and Consistancy
This principle explains that you need to mean what you say
and do what you say your are going to do. People tend to want
to be both consistent and commit to their word. Getting
customers or other people to publicly commit to something
makes them more likely to follow through with an action or a
purchase.

8. Reference
Visit http://twool9.com/ For more information
Robert Cialdini’s book “Influence: The Psychology Of Persuasion”
By
Thomas Wooldridge