People who are reborn in Sukhavati receive instruction in the dharma from Amitabha. Ultimately they will become bodhisattvas and Buddhas. Thus getting to Sukhavati was a popular aspiration.
Devotees are encouraged to visualize Amitabha’s pure land, which, if done faithfully enough, will enable them to be reborn there.
Amitabha is associated with the setting sun in the west (hence, death).
In worship, one is expected to repeatedly chant Amitabha’s name. Thus in China worshipers chant “Amitofo amitofo Amitofo Amitofo…” In Japan they say “Amida Amida Amida Amida...” This helps to facilitate rebirth in the pure land