Morning Star wrote:
...First thing I will have to engrave on my brain, is to watch the lines, especially the vertical ones, like doors, sides of buildings, street lights, etc. so if they have to topple over, at least they topple equal amounts from left and right...
I have a 14-28 for my FF camera. Don't use it much but it gives me fairly straight verticals if I hold it level. As soon as I aim it up or down the verticals start to bend.
Shoot raw, and if you get distortion you can mitigate it in post. I use PS which has a warp adjustment that's pretty good for that (but it takes some practice).
The 14-28 is big and bulky and doesn't fit well in my bag, so it's frequently not there. If I don't have it and need to do a wide landscape, I stitch. I have actually stitched some indoor shots taken at 14mm and it does fairly well, but at those angles it's hard to avoid distortion.