The Johannes theme provides quite a few different layouts for post listings which you can fully manage and tweak to your needs, then choose to display them on the Front page or any Archive template later. To manage the layout options, go to Appearance -> Customize -> Theme Options -> Post Layouts.
All of the layouts have very similar display options, like choosing whether you want to display a category link, metadata, a text excerpt, etc… There are basically two design groups of the layouts: Featured post layouts can be used for the featured area on your home page only, while classic listing layouts can be displayed on both the home page and archive templates.
Note: Changing the image aspect ratio
Whenever you change the image ratio for a specific layout, please make sure that you run the Force Regenerate Thumbnails plugin afterward, as WordPress needs to recreate images based on the new dimensions you specified.