Ziplines
Ziplines are the fastest way back to the lanes. Always use them after respawning, and watch for ambushes while riding.
Dashes and slides
Dashes are for dodging and slides keep your speed on slopes. Chaining them with jumps makes you a much harder target.
Parry
A well-timed parry cancels an enemy melee attack and leaves them briefly open. Practise the timing in unranked games.
Positioning
High ground and cover are your best friends. Before a fight, stand where you can shoot but still have a way out.