Avoid taking bad trades in lane, take D shield or Doran's blade based off of matchups

Use Your Q to poke and make small trades. Build defensive early depending on champion match ups.

His passive is simple, each time Darius auto attacks or uses an ability on a target he applies a stack of hemorrhage/bleed, at 5 stacks Darius gains NOXIAN MIGHT which gives him the ability to pass on bleed to all targets through autos or abilities.It also gives him 30 − 230 (based on level) Attack damage.

Your Q is a wide AOE swing. Targets take more damage on the Outer blade of the axe and this heals you. The inner part of your Q is the handle it does the least amount of damage. So always aim to hit your outer Q. You heal for 15% per each champ hit (45% at 3 champs).

Your w is an auto attack reset, slow and free semi sheen proc that increase your auto attack when used. The slow is 90% for one second. Your auto attack range increase when your W is active. His W can be used to last hit creeps since it refunds mana and cooldown when it kills a target with one hit (use it to CS under towers).

Your e is a hook(get to know the range),also provides a slow and armor penetration. Slow is 40%, Armor Penetration at max range e is 35%. TIP When you use your e Darius instantly auto attacks a pulled target without you initiating an auto (only champs).

Your R is nasty it gives you the 1v5 feeling. Darius R is an execute ability when enemy champs HP is at a certain threshold, if champion is killed with it Darius gains his passive NOXIAN MIGHT which gives him the ability to pass hemorrhage to all targets. Darius Ult at max rank as no mana cost and instantly resets upon each execution, it always does true damage at 5 stacks of bleed.

Simple Darius Combo
E into an auto attack,into W auto reset, into Q, then two autos or one auto then ult.(easy 5 stack)
Q into e auto,into w auto then followed by auto into ult or another auto then ult.

Usage of Abilities
You can Q flash into people,you can flash R and flash E, W too.
Use W on turrets more damage is done.
Use R on slow hp targets you can kill to gain 5 stack or use R to get 5 stack off of 4 stacks.

This should be simple for all top laners. Since darius doesn't have TP he is mostly at top all game. So paying attention to the map is important at all times knowing where both junglers are and tracking jungle camps will give you so much information on your decisions keep this in mind at all time.

Your location around the map should be based on game state and objectives. If dragon is coming up, you should be botside by 50 secs to drag.If baron is coming up be either mid or top lane simple. If scuttle is up be there for your jungler, or invade into enemy jungler with your jug and snag a flash or kill. That's about it. :D