The A-pillar, located between the engine compartment and the passenger cabin, and above the left and right rearview mirrors, can obstruct your turning visibility, especially when making a left turn, thus requiring special attention.
The B-pillar, located between the front and rear seats of the passenger cabin, is a vertical support extending from the roof to the vehicle's floor; viewed from the inside, the seatbelt is attached to the B-pillar.
The C-pillar is located on both sides of the rear seat headrests and requires special attention.
In summary, the A-pillar, B-pillar, and C-pillar are all important components that support the structural strength of the vehicle.