Next to Placing Wards, Here Is One More Important Tip for Low Elo Players

DON'T TRY AND DRAW EVEN ON SOMEONE AFTER HE KILLED YOU IN LANE PHASE

It is IMO the #1 reason on why people lose games in low elo (might be exaggerating, but I encounter this problem in at least 1/5 games in high bronze)

If you just gave up first blood to the top, mid or adc, he/she has the upper hand, I repeat, HE/SHE HAS THE UPPER HAND!!!

The last thing you should do is try again at killing your killer. It doesn't matter if you got super close, this guy now has a couple hundred gold advantage from the kill and bonus CS he/she got while you were dead, that's huge in low levels as now some items are bought and you'll get melted that much quicker, don't give that ADC a 5/0 score in 12 minutes or your chances of losing just went up by a huge amount.

What you should do after something like this as happen is simply just farm and not push your lane, bring the minions back to your side of the rift so that your jungler or top has a chance at ganking and getting you back in the game.

Remember, league is more about killing the nexus, turrets, inhibitors, dragons and baron nashor, minons > enemy champions.