FIRST BLOODkill the enemy champion once — one life each
CLOCKif the 3-minute round runs out, higher HP wins
You get a skill point every level (a level every ~35s, 5 total): spend it on an ability — Ctrl+Q / Ctrl+E / Ctrl+R for a basic, Ctrl+F for the ult (unlocks at level 5). Basics cap at rank 2, so you can't max everything — build a plan.