Hi Gabe,
You’re right. There are several basic, universal principles for photo editing that apply no matter whether you’re a Lightroom or Google Photos editor. 🙂
Not to toot my own horn, or anything, but I made ~30 minute video tutorial on how to edit photos in RawTherapee. While it is somewhat program specific, (obviously) I intentionally tried to teach some of the basic editing principles as I went along. So you might check that out for starters. Perhaps James knows of some other Lenspiration approved videos. 🙂