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We review the theoretical underpinnings, evolutionary status, calibrationsand current applications of three bright Population II extragalactic distanceindicators: Tip of the Red Giant Branch (TRGB) stars, RR Lyrae variables andJ-Branch Asymptotic Giant Branch (JAGB/Carbon) stars. For M_I (TRGB) = -4.05mag the Hubble constant is determined to be Ho = 69.8 +/- 0.6 (stat) +/-1.6(sys) km/s/Mpc.

Population II Distance Indicators: RR Lyrae Variables, Tip of the Red  Giant Branch (TRGB) Stars and J-Branch Asymptotic Giant Branch (JAGB/Carbon)  Stars