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hi I hope to be in good condition, I want to answer these questions

What is left /right-handed? What froms of bilinears can we have, can you split them in left/ right handed parts
What is the definition of gauge theory
Can you give some arguments why we want gauge invariance
What is a covariant derivative and why do we like it so much
What is the main physical consequence of introducing local gauge invariance
Explain how the covariant derivative ’’works’’ i.e. how it allows gouge invariant lagrongian to be construdated
What is a group and what does it have to de with gauge invariance
What is a representation of a group?can you give some examples of group ,Lie groupe and representations
وشكرا لكم