Questions About Wireframe Migration to Webflow and Padding Adjustments

Moving the wireframe over to webflow, I have a few questions:

1.
What is the reason for each section to have "padding-global" and "padding-section-large"?
2.
What is the point of adding the specific elements "margin-bottom" and similar elements, when we could just put padding or margins around the elements with actual stuff in them (text, images, buttons, etc.)? (this may be the same question as #1, I'm not sure)
3.
Is there a way to change the "padding-section-large" or any of the above elements I've named so that the white space isn't so...large? I'd like it o be medium or small but not sure how to do so.