It covers the ON RRP, IORB, Discount Rate and SRF channels, explaining how together they set a corridor with upper and lower limits for the effective rate.
Prior to today the article reading experience was subpar, due to the amount of supporting images - the thread is composed of several shorter posts, and each one came with an image.
I've made it a lot more readable by removing most of the images
You can read the article here: https://illya.sh/threads/how-does-the-federal-reserve-set-interest-rates