Get used to every champion's auto attack animations.

Some have really scary awful ones like Anivia, Janna, Karthus etc. and some have nice clean ones, like Caitlyn. Just practice them all and you'll get used to them

Another thing, though I don't know Ori's AD, or AD per level.. And since you are level 11, with no runes or rune pages.. I'm not 100% it will apply, but I'm going to throw it out there anyways.

Most of the time, if you are pushed under your tower, assuming all your minions aren't focusing the minion, it works like this.

Melee Minion - 2 tower shots, you auto attack once, dead.

Caster minion, attack BEFORE the tower, tower shoots it, you attack it once more, dead.

And I noticed you said you didn't know about cancelling your attack animations, yes, meanwhile I don't think it will benefit an Orianna player much, there are many abilities that if you use immediately after your attack, it resets your animation, usually increasing the speed in which you attack.

There are also many champions that, at high level play, to be used to their full potential require you to move after each attack, because their recovery animation, I guess you could call it, is so long.

Essentially, when you attack, the moment you see the damage numbers pop up, move your character, even if it is just a little, then target the next target, or the same target right after. Practice this and meanwhile, since you are new, you may not notice a huge difference in your attack speed, it is there.

It is most noticeable when chasing enemies, though, again, hard to master, your character moves faster if you run to them, attack them, then move past / along side them, attack again, move, attack, move, attack.

You will get in many more attacks and cover ground quicker using this method.

Take fiora and max W or take Yi and max E. Super easy to last hit l0l

I recommend doing what I call a "Test Hit" first, just to get a feel for how much of the HP Bar you do.
First i'd do it to the sword and shield Minions, then the mage minions, then the Artillery ones.

Once you deduce about how much of the bar you take out per attack, use it to calculate when you need to hit. Keep in mind two factors:
1) If You're ranged, take into account how fast your auto-attack projectile gets to the target. People like Ahri actually do a 0.5 sec wind up before they actually send their projectile out.
2) Other minions attacking it.

I recommend learned to use the "S" Key on your keyboard to not attack minions passively. Use that and camp by the minion you're going to last hit, and when it gets low enough for the last shot, attack it.

Hit a minion to see how much damage you do:


Hit a melee minion, it does 50ish, watch the health bar on the top right in numbers, click when it says around 60ish and you should get it.

As you do this look at the size of the health bar on top of its head, than compare number and bar size, click to hit when its the right time to last hit.


I suck at explaining