Answer:
Transitions
Step-by-step explanation:
Transitions are linking words that connect or oppose ideas and sentences, as well as for settling a relationship with the main ideas in a paragraph. 
There are a variety of transitional words that can be used to indicate different purposes. 
For example: 
"Furthermore" is a transitional word that indicates addition.
"However" indicates contradiction or contrast.
"Due to" indicates a cause and an effect.
"First of all" signals a numerical sequence of ideas.