Aphelios vs Tristana

With Gravitum as your main weapon, hit your target to slow them, then cast Weapon Abilities (Q): the cannon roots every enemy it has slowed.

Switch to the right weapon with Phase (W) before Moonlight Vigil (R): you then attack each champion hit with your main weapon, and its effect applies.

Before an objective, check Weapon Queue System (E): it shows the weapon Alune will give you next, and an empty weapon goes to the back of the queue.

Don't stay glued to your minions: when her autos kill them, Explosive Charge (E) damages nearby enemies, and her bomb also explodes in an area.

Back off as soon as Explosive Charge (E) is stuck on you: each of her hits makes it stronger, and a bomb that explodes at max stacks resets Rocket Jump (W).

When she activates Rapid Fire (Q) in a fight, back off until the bonus ends, or stun her if you can: her attack speed spikes for the spell's duration.

In teamfights, when Explosive Charge (E) is on you, spread out from your allies: when it explodes, the bomb also damages anyone near you.