I've spent the day pulling out what remains of my hair attempting to change some basic coding built-in to the template this blog uses. (That's why, if you happened to peek in at various times it looked wonky.)
I do not know CSS. I was relatively proficient in HTML twenty years ago, but I haven't had much use of it since then.
All I wanted to do was to automatically have the blog posts appear in bold type, without having to use the deprecated <b> and </b> commands every. damn. time and maybe change the color of the font as well.
So like any deprecated nerd, I went to the font of all wisdom, Google. That led me to several YouTube videos that explained how to do it. Unfortunately, even when following the instructions to the letter, I wasn't getting what I wanted. The titles would go bold and colored when you clicked on them and opened the individual pages, but it wasn't working on the main page. They remained stubbornly black and not bold.
I finally grabbed the CSS Style sheet off the blog and started pouring through the code. From what I learned from the videos I needed to find anything that said entry-title. Slowly but surely I went through and added the additional code—one entry at a time—to the Additional CSS pane in the editor until I got the desired results. This may ultimately have some unintended results, but we'll have to wait and see. All in all I'm satisfied with the results now, however.