I recommend the introduction to
Class.Quant.Grav.27:245026,2010 DOI: 10.1088/0264-9381/27/24/245026
https://arxiv.org/abs/1008.3621
which is reasonably accessible and high-level in a way that's hard to find for asymptotically safe gravity (which is unsurprising given that renormalization group flow is a bit abstruse).
I recommend the introduction to
Class.Quant.Grav.27:245026,2010 DOI: 10.1088/0264-9381/27/24/245026
https://arxiv.org/abs/1008.3621
which is reasonably accessible and high-level in a way that's hard to find for asymptotically safe gravity (which is unsurprising given that renormalization group flow is a bit abstruse).