Are you good in explaining different body language signs? Please tell us what are the body language signs you know and what does it mean?

اغلبها يسهل معرفته الاضطراب - الثقة - الاندهاش - الغضب - الفرح 

وبعضها كالكذب والصدق يصعب معرفتها

Body language is very important whereby I can analyze a person who Front Is it honest or a liar There are many references used in public relations and flags and there are signs used to put solutions in times of crisis and problems and some signals the body means the confidence level of the person in front of himself,,,, etc.

I possess the skills to read a person's face through facial expressions and movements of a person in a state of anxiety and the way his words and his looks and appearance and all what he is doing and speak of it

لست متخصصاً بطبيعة الحال بهذا الجانب, ولكنني أعرف بعض الدلالات الجسدية كـ (الجلوس باضطراب: والتي تدل على ضعف في الثقة بالنفس), (حركة العينين المضطربة وكثيرة التنقل: والتي تدل أيضاً على قلة الثقة بالنفس), (تحريك العينين إلى الأعلى أثناء الحديث: والتي تدل على ضعف المصداقية).

generally i have known face expression, body expression, eye contact, smiling, blinking etc.

اول مرة اسمع عنها لغة الجسم ولكن ( تاميكو) اعتقد انه قرب الوصف الى حد مآ.

Body Language - technically known as kinesics (pronounced 'kineesicks') - is a significant aspect of modern communications and relationships.
Body Language is therefore very relevant to management and leadership, and to all aspects of work and business where communications can be seen and physically observed among people.
Body language is also very relevant to relationships outside of work, for example in dating and mating, and in families and parenting.
Communication includes listening.
In terms of observable body language, non-verbal (non-spoken) signals are being exchanged whether these signals are accompanied by spoken words or not.
Body language goes both ways: Your own body language reveals your feelings and meanings to others.
Other people's body language reveals their feelings and meanings to you.
The sending and receiving of body language signals happens on conscious and unconscious levels

I understand dealing with body language, whether express or understand the language of the body of the other party, such as the language of the eyes and facial expressions, hand signals and physical body language signs is a science can not be reduced to a succinct answer

I don't say this with100% accuracy.
It can depend on certain factors because some of these things I take as explaining body language signs could be culturally acceptable.
When someone is uncomfortable with the words leaving their mouth (telling lies).These signs are also the same as when someone doesn't like you, or can't move beyond stereotypes: -A tilt of the head when speaking -Narrowing eyes -An odd increase in the volume of one's voice -A broken gaze etc..
When someone is uncomfortable or shy, their body tends to "shrink" into their chair.
This includes crossed arms/legs, lowered head.

Eye Contact, Face Expression , be on the same status of the customer ,if he is angry let your expression be the same