Endgames:The Royal Diagonal

I saw NM @RobRam 's video and was willing to make a blog on this so at the end you'll see the video 

The Royal Diagonal is a new way to get to a place in same moves but gives you advantage at endgames where you can use The Royal Diagonal,the term Royal refers to King and Diagonal gives you a meaning that this is a special diagonal which it is actually.
,you can use a sideway to get to the same square in same moves ,confused?,see this image 
you see here the king wants to go to e7 instead of going straight they can use The Royal Diagonal by moving the king as the arrows show you.
What does The Royal Diagonal do?
Although the Royal Diagonal gives you some advantage ,you need to know it 
,like at this position

there is oposition so look and see the moves

at this position you see there isnt oposition and white tried but nothing stopped it

now my friend will show you more about it