The skills you need guide to interpersonal skills

Demonstrating Intelligence
Charismatic people want to be able to communicate effectively with others, so are 
usually good at initiating conversations. They tend to be intelligent, with an up-
to-date knowledge on current affairs and rounded general knowledge. This makes 
small talk, the sometimes awkward beginnings of conversations, easier.
Charismatic people often have expert knowledge in some area—they are able to 
explain complex topics in such a way that their audience understands, adapting 
their explanations according to the abilities, views and expertise of their audience. 
Expert knowledge also inspires the confidence and belief of others in the abilities 
of charismatic people.

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2.
ADVANCED COMMUNICATION SKILLS
Being Assertive
The power of charisma is the ability to make people want what you want or 
unite in a common cause. This ability can be used for both good and bad causes. 
Charismatic leaders may be able to influence and encourage their followers, and 
motivate people to do what they want. A charismatic confidence trickster may 
be able to use their skills to gain the trust and respect of their victims before 
ultimately extorting money or other valuables.
Charismatic people are assertive but usually in subtle ways. They can 
persuade through their words, encourage with their optimism and confidence, 
and be assertive by using their understanding of emotions, both theirs and 
those of other people.