[cma]

Good overview here: https://en.wikipedia.org/wiki/Cosmic_distance_ladder

More: https://www.math.ucla.edu/~tao/preprints/Slides/Cosmic%20Dis...

https://terrytao.wordpress.com/2020/10/10/climbing-the-cosmi...

[ricardo81]

Really enjoyed the math.ucla.edu link, good pace for me. Thanks.