Don't X out your screen, you aren't in a HoN blog. Yes, denying also exists in LoL, but it isn't like it is in other games. In dota/hon denying means literally last hitting your own creeps so they can't. **** move huh? Well believe it or not, you can also deny in LoL, but in different ways. I classify denying in two different ways - denial by pressure and denial by pushing. This is a really valuable skill to have and can help you drastically win in cs.
Denial by pressure
This is also known as "Zoning" and fine, I'll do it. I'll copy/paste that world famous zoning tutorial that if you haven't seen by now, you're just way behind the times (it really explains it quite well, so pay attention).
Basically, if by design your champion just out lanes the other champion, you should do the best you can to zone them out and deny cs/xp. Usually it isn't very realistic to completely zone out the other laner if they know what they are doing, but you can, at the very least put pressure on the other champion and make him lose cs. Consider the following when deciding when to zone someone.
- Starting items. Doran's ring? Harass the **** out of the dude and make him burn pots. Oh wait, he has none.
- Range/Poke. Ranged champions have a huge advantage over melee champions in lane. Punish them for every last hit they try to get, and you better believe they'll think twice. This is especially vs a melee mid, such as kassadin/gragas (early on ofc).
- Champion strengths. This just comes from playing the game. If you've got a champion that straight up wrecks another champion in lane, you have absolutely no excuse for not being aggressive. Cait+Taric lane? Abuse that ****!
- Health/Mana levels. This is a big one people overlook. If
Brand is out of mana, get aggressive! There's nothing he can do about it.Now if it isn't possible to hardcore zone someone, which it usually won't be, you can also just slightly pressure someone. This is HUGE in mid lane, and is actually the easiest way to land abilities on any champion. Ever wonder why that cassiopeia never missed a Q on you? Well it's probably because of this.
Whenever the poor guy tries to last hit, hit him with an ability. This is going to cause him to make a split second reaction. Do I tank the damage or lose the last hit? Either way is a win for you. This is one of THE most important keys to winning your lane, and it goes for bottom lane as well.
Corki going up for a last hit? Hit him up with a few autoattacks.Denial by pushing
This one is much simpler, but I still see a lot of people not abuse this. IF you have a champion capable of clearing creep waves extremely fast (
Malzahar, 
Galio, Brand, etc etc) then do it. If you can manage to push the creeps in your lane into their tower, they are guaranteed to lose cs and exp. This also locks them in place in the lane and allows you to free roam for ganks. NEVER underestimate this.Pushing out a lane can not only win and lose lanes, it can win and lose games. Not only are you gradually taking a CS lead over the opponent, but you are simultaneously available to gank other lanes, while the enemy has no idea where you are for that brief period. You are pretty much going to be mia for 10-15 seconds at a time which is a lot of pressure for other lanes as well, whether you decide to gank or not.
If you REALLY want to deny the enemy, harass them at their tower, or just attack the tower. If you attack their tower they are probably going to start attacking you, which loses them even more CS. This is getting pretty ballsy though, and you'd better make sure your lane is very well covered by wards.
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