Elaboration is the giving the details or examples about the
point you have given, can be found in the textbook. Linking
statements is to use these details or sub-points to explain and
describe the process that lead to the outcome in the question, in
short, to answer the question.
e.g. Competition from new trade rivals was the most serious
reason for the fall of Venetian trade.
Point 1 - Over indulgence in affluent lifestyles
Elaboration - Nobles are addicted to gambling and lost their
fortunes, indulged in parties and celebrations that lasted 6
months. etc
Link - (Explain how these activities lead to the fall of Venetian
trade) As the nobles indulged in an extreme affluent lifestyle,
they spend less effort in their own work and in coming up with new
strategies or ideas to improve their trading industry in order to
stay ahead. Therefore, Venice began to lose a competitive edge over
their rivals and this led to the fall of Venetian trade.