What are different types of FIRE strategies for early retirement?

FIRE (Financial Independence, Retire Early) focuses on aggressive saving and smart investing. Variations of this approach include Lean FIRE which aims to reduce post-retirement expenses, enabling a smaller savings goal. Coast FIRE, which focuses on saving aggressively in 20s and 30s and taking lower-stress job later. Barista FIRE means not retiring fully, but earning through part-time work.