Avoid straight objects in the margin
One common problem of wide angle lenses is the perspective distortion when the camera is not aligned perpendicularly to the subject. In other words, buildings like lighthouses appear to be falling if you (correctly) place one according to the rule of thirds. Well, the bad news is that there is no a universal solution. The best one is obviously to buy a lens with excellent optical quality, but they are very expensive and in any case the perfect lens does not exist. So we need to correct the distortion in post-production. There are a thousand ways to do that, but most of them require an image crop. For that reason, if you have a straight object in your frame, don’t put it exactly on a vertical line of the Rule of Thirds, but slightly closer to the image center. In that way, after correcting the distortion, your lighthouse will be nearer the vertical line of the third.
In the image below (that it’s another good example of leading lines) if I had put the small village too close to the frame edge, it would be affected by perspective distortion and to correct it in post production probably I would have lost the nice leading line with a crop.