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Various small points that it doesn't matter too much if you don't know or use them

'@' symbol 

apart from being used in front of a string to change how compiler interpret the string (verbatim or not), it can be placed also in front of a variable which may otherwise conflict with observed word:

'??' symbol

null coalesce operator, basically 'A ?? B' is equavalent to expression with tertiary operator 'A != null ? A : B', which when made a sequence may allow you to choose the first non-null:

string answer = answer1 ?? answer2 ?? answer 3 ?? ...

(To be continued ...)

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