Since I am now trying to grow with X-Plane 10, I want to better understand what to do to make it work best. One question comes to mind about aircraft developed for it. What are the significant differences between A/C developed exclusively for X-Plane 10 and previous versions of X-Plane?

There's practically NO differences at all! It is how X-Plane renders them that's different, and there are a few additions developers may add lighting wise. Outside of this, version 9 and 10 are pretty much the same and all version 9 aircraft will work in version 10.

There's practically NO differences at all! It is how X-Plane renders them that's different, and there are a few additions developers may add lighting wise. Outside of this, version 9 and 10 are pretty much the same and all version 9 aircraft will work in version 10.

Thanks for that piece of info. - One less thing to worry about.