To read comic books, you first focus on the main characters and their actions shown in the panels. Then, read the words to know what they're thinking or saying. Also, notice the background and any symbols for added context.
Well, you start by looking at the pictures and reading the text. Usually, you follow the panels in a sequential order to understand the story.
Mostly, you read the dialogue and captions along with observing the illustrations. Pay attention to the details in the art to get the full experience. Sometimes, you might need to flip back and forth to catch all the nuances.