Map Awareness
Riot has garnered some pretty effective videos with their Video Tutorial contest (Links posted below). As a beginner, you want to primarily focus on making sure you don't get ambushed by the other team (called a "gank"). While some of this involves Map Awareness, you also need to learn to not overextend, as well as keeping an eye on the enemies you're fighting in your lane. If you cannot see one or both of the enemies in your lane, let your teammates know!
Last Hitting
Killing minions and enemy players nets you gold to buy items. However, if you don't land the killing blow on an enemy minion, you will get ZERO gold, even if you've done most of the damage to it.
The faster you kill enemy minions, the faster the minions reach the enemy tower, which will make quick work of all non-cannon minions. It's better to keep the minion fights as close to the middle as you can; you only need to finish off the minion to get gold from it -- see if you can limit yourself to only attacking minions when you will kill them!
Tower Aggro
The enemy towers are dangerous. They have lots of health, armor, and a powerful attack that can quickly decimate low-level heroes. It's important, then, to know how the turret picks its target.
Enemy towers will always target allied minions first, switching to champions only if there are no longer any allied minions around. The exception to this is if you deal damage to an enemy champion, in which case the tower will immediately switch to the damaging champion, shooting at them until they die or move out of range.
Let me repeat that: If you deal damage to an enemy champion within range of the tower, it will immediately start shooting at you: You do not want this. Be very careful when attacking the enemy at their own tower.
Recommended Viewing
Four of these videos are a result of the Valoran Video Contest held by Riot Games, and are quick, 1-minute videos touching on just the basics (which seems exactly what you're looking for). The fifth video is made by Shurelia, an employee of Riot Games, and goes much more in-depth into what "Zoning" is, and how to take advantage of it.
General
- Custom games are only worth 75% of the IP you would have earned in a normal game.
- Co-op vs. AI games incur penalties based on summoner level and difficulty:
- Level 10-19: Beginner games are worth 85%.
- Level 20-29
- Beginner games are worth 70%.
- Intermediate games are worth 90%.
- Level 30
- Beginner games are worth 55%.
- Intermediate games are worth 80%.
Win
- 2.305 IP per minute up until 55 minutes.
- 18 IP bonus for completing a match (~7.8 minutes worth of IP)
Loss
- 1.402 IP per minute up until 55 minutes.
- 16 IP bonus for completing a match (~11.4 minutes worth of IP)
Graph
Optimum Game Length
Riot Games has designed their IP system to reward playing the game to completion and to reward longer games:
Q: Will I be getting more or less IP and XP as a result of this change?
A: While you will get more or less in some games, the average XP/IP gain will be much more consistent. If you typically played very long games, you will tend to get more IP and XP; however, if you typically play short games, you will get slightly less IP and XP.
While you do get a bonus beyond the "per minute IP", that bonus is designed to compensate players for the time between matches:
Q: It seems unfair that I spend 5 minutes milling around in queue and in champion select, and don't get an IP/XP reward for that. Does this system help with this at all?
A: Actually, it does! All game types give a slight 'completion bonus' that is equivalent to several minutes of play. This is embedded in IP you earn.
That being said: provided you could get into another game in substantially less that 7.8 minutes, you'd make out slightly better by surrendering and starting a new game. You'd have to do this a lot to see a substantial gain, however. If it took you longer to get into the next game, you'd actually incur a loss overall.
In short, it'll usually be best to play to 55 minutes, then bail out if you're very likely to lose. At that point, you're essentially playing to see if you'll get 145 IP vs 94 IP. If losing seems like a foregone conclusion, then you're mostly playing for the experience at that point.
Sources
- Items in the general section: League of Legends @ Wikia
- Win/Loss Accrual Rates: Based on recorded values after the completion of games. There are some instances where (rate * minutes) does not exactly equal what I recorded from the game client when you round up, but overall the above rates serve as a good enough rule of thumb for my purposes.
- IP System FAQs
Reference
Best Answer
If you see "Leaver" on the end of match summary screen, that summoner received no IP for the match.
However, just having left the match early is not enough - League of Legends has a 5-minute grace period before a summoner is counted as a leaver (and it gets reset if they rejoin). I once received a "win" from a game I did not finish (powersurge) because the enemy team surrendered before I had been gone for 5 minutes.
Neither of these affects the fact that you can report someone as "Leaver/AFK" via the Report Player button. While these summoners might still earn ill-gotten IP, they're also likely to get banned or suspended from their behavior (rendering the point moot).