Back in Avialliance we had a few lessons on how to do this. It would include lining up your nose to the runway center, slowing down to the point where you could stall if you were any slower, and slowly let gravity bring down your plane. Keep your nose up about 30 degrees and let the back wheels touch first, don't hold the S key or back key whatever you use to brake or go backwards because you will nose dive. If anything I suggest you slowly keep tapping W until you're completely landed, until then let the plane itself take itself into landing, so you won't have any brake errors.
Once you are about halfway runway, you can start slowing down.
So tips:
Don't nose dive by braking once you touch ground
Level out about 30 degrees or so to let the back wheels touch
and slow down to where you can possibly stall, but without having to keep the plane in a fast speed, continue going forward.
Also for vehicles, some are different. Avialliance had a special set of planes that I think Eksi edited, or someone, so that they clip into the ground or something, so it's not so bumpy of a land, and that once you touch down your wheels don't just brake.
