[Theme: Argent] Help with post layout

I’m trying to clean up my posts and make the tags, date, and post info show up at the bottom instead of the left side. I also want to realign the paragraphs and center them up under the title. Last thing, I would like to make the header image smaller to where it fits the screen instead of being oversized.

Below is a link to a screen shot that puts a visual to it.

https://imgur.com/YTXUvEz