Cohesion is the set of links that tie parts of a text together. A pronoun can point back to a person or object, repeated words can keep the topic in view, and a transition can show how one idea relates to the next.
Follow the links across sentences
The garden club built a rain barrel. The barrel collects water from the shed roof. It supplies most of the water for the seedlings.
The barrel repeats the key noun with a definite article. The pronoun it continues that reference. Each sentence gives readers a familiar starting point before adding information.
Choose a transition that matches
It rained overnight. As a result, the barrel was full by morning. The transition signals a consequence. For contrasting ideas, a word like however may fit. Cohesion helps readers follow the connections, and the underlying ideas still need a logical relationship.
