Hi, im a summoner in EUNE(Platinum IV)and im a huge fan of sirhcez.I used to play nasus way too much since i like to farm a lot(that's my playstyle actually)so i like champions with stacks.I noticed that most of the builds were incapable of making you understand the use of Nasus so i will help you improve your nasus skill by 50% at least.That is my 1st guide so im waiting for some feedback :)

The whole point with the runes i made is sustain.The more u sustain on your lane, the more stacks you have.The more stacks you have,the easier you carry.

Kind of same purpose with the runes.

Items on Nasus are helping him to be the ultimate tank,since his damage is provided from his Siphoning Strike(Q) and trinity helps you land crits with it,so you will need nothing more than these,it's the most viable build on top lane by far.

Nasus is a tank.That means that he can take several damagewithout dying,so here comes ghost.Nasus escapes(and hunts)way too easy when he has Ghost,since he uses his W to get way too far from his opponents.Most of the times i have countered many ganks of an udyr with this combination.I don't say that flash is bad,just ghost better.Now,about the Teleport there's not much needed to be told.The faster you get back to your lane,the more stacks you have.Also you can use it to roam,like havethe homeguard and teleport to a ffriendly ward.Like that,you initiate a 2v1/3v2 fight which will probably end with some kills for your team and maybe a neutral objective(tower/dragon).

When you are farming keep in your mind that all of your minions focus 1 minion.You should 1stly kill the minion that is focused by your ones and then go for the rest(prioritize tanks/super).

Since you are the tank,you are the front line of your team,trying to avoid the 1st line of the enemy team and ehad for the carrys.Ghost and Wither(W) will help you on that a lot.Try to make the enemy team use most of their spells(especially ultimates) on you so that your carries escape the danger.

What you basically do late game is leave your team on 4v5 and split push.Thanks to your stacks on Siphoning Strike (Q) you will rapidly destroy towers,When a teamfight errupts teleport on a ward to join the fight and make it 5v5 or 5v4(in this case someone (or maybe 2) will come to stop you, so by teleporting you get the advantage for your team on the teamfight).
!!WARNING!!Only Split-push when your teleport is not on cooldown!!