Lightroom edits

I’m still learning how to use Adobe Lightroom. I can use the basics but I’m looking at possible online courses to learn more. I see people do such amazing and creative things with the program. I need to take a bunch of photos with the specific goal of just playing with the editing. A collection of pictures I don’t care about messing up with whatever I do in Lightroom. I downloaded some old pictures from an Alaska trip a few years ago. The pictures were taken with my old Nikon D50 and an IPhone. I changed the light, sharpened, changed temperature, contrast, and took the noise out. Not sure how much of a difference I really made. They were fairly good pictures to begin with.