Because WordPress themes are often imperfect, depending on the use, you often have to customize them in various ways. Sometimes it’s adding a logo or featured/header/hero image. Sometimes it’s tweaking the sidebar or widget layout. Sometimes you just need to add or adjust some of the CSS.
Normally, I would recommend customizing more than a few things as a child theme. That way when the base theme gets updated, if you modified your files, they’ll be safe. You can also customize things through the Customize tool. This allows you to set various settings, as well as add CSS. Couple this with Custom Snippets, and you can do quite a bit without having to crack open an editor and SFTP your files back and forth.
To that end, I’ve started saving and documenting some of these tweaks that I use for DeGruchy.org. Everything stored in git on SourceHut. I’m planning on adding more documentation, like plugin usage and some innocuous configuration settings.
Check it out!