If I understand this challenge correctly, it is to use an editing tool to ensure a straight line is visible within the photo. I struggled with this, so instead, I took a photo of some artwork in my office. The framed photo in the middle has driven me crazy in trying to hang it as straight as I can. It was when I recognised that the frame is straight but the photo subject (part of our local Busselton Jetty) leans to the right I understood the problem!
I’ve seen the photo there are straight lines which one are you focusing on? 🙂
I found that challenge a bit confusing so I can’t really answer your question Ranu 🙂
I see what you mean… looks to me like the photo on the right is skew! 😉