How to create sections? [on hold]


I am new to Drupal and I try viewing it as an HTML/CSS website. What I would like to do is have multiple sections(containers) with different backgrounds and content one after the other.
Something similar to this example:
Or just image 3 containers with different backgrounds and content from each-other that have their CSS class for styling.

Problem is that I am not sure exactly how to achieve that. I have created a basic website with a theme and tried creating a block and styling the theme from CSS. Even though it works it is not practical because for every page I have to create a new block.

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