In writing, you call those bridges transitions. You move from one idea to another without slipping and falling into the murky water between ideas.
Transitions tie writing together. They connect two parts of a sentence so readers clearly understand the meaning.
Example: Most students did well on the test. Lonnie made a grade of 50.
We need to build a bridge to connect them. That is, we need a transition from the first sentence to the second. You can easily fix this example. Put a comma or semicolon after test and add: although, however, or but.
I write well-crafted transitions for a smooth, readable style.