In the early game, AD carries need to focus on building items that provide a strong laning phase. The core items for ADCs in the early game typically include a Doran's Blade for sustain and damage, as well as Berserker's Greaves for attack speed. AD carries should also prioritize purchasing a Vampiric Scepter for lifesteal, which can help them stay in lane longer and sustain through trades with the enemy bot lane. Additionally, purchasing a control ward to ensure vision control in the bot lane is crucial for avoiding ganks and maintaining pressure in the lane.

Mid Game:

As the game progresses into the mid game, AD carries should start to build items that provide a balance between damage and survivability. At this stage, purchasing a core damage item like Infinity Edge or Essence Reaver is essential to bolster the ADC's damage output. AD carries should also consider building a Zeal item such as Rapid Firecannon or Statikk Shiv to increase their attack speed and critical strike chance. Additionally, purchasing a Guardian Angel can provide the necessary survivability to survive team fights and skirmishes.

Late Game:

During the late game, AD carries need to focus on maximizing their damage output while also prioritizing survivability. It is crucial for AD carries to complete their core damage items such as Infinity Edge and Statikk Shiv or Rapid Firecannon to ensure they have the necessary damage to deal with tanks and squishy targets alike. Additionally, AD carries should consider building a defensive item like Guardian Angel or Mercurial Scimitar to protect themselves from assassins or crowd control effects. Proper positioning and target selection are also crucial during team fights to ensure that the AD carry can output maximum damage while staying safe.

Siege/Protect the ADC Composition:

In a siege or protect the ADC composition, AD carries should prioritize building items that maximize their damage output and survivability. Items like Bloodthirster and Guardian Angel can provide the necessary sustain and protection for AD carries in a protect the ADC composition. Additionally, building a Mercurial Scimitar can help AD carries cleanse themselves of crowd control effects and stay safe during team fights. Proper coordination with the team, particularly with peelers and tanks, is crucial in a protect the ADC composition to ensure that the AD carry can deal damage safely.

Dive Composition:

When playing in a dive composition, AD carries should focus on building items that provide self-peel and survivability. Items like Phantom Dancer and Mercurial Scimitar can help AD carries survive dive attempts from enemy assassins or bruisers. Building a Guardian Angel can also provide an additional layer of protection, allowing AD carries to resurrect after being taken down in team fights. It is important for AD carries in a dive composition to communicate with their team and position themselves carefully to avoid getting caught out by enemy divers.