Donut glass cup render has too many grains and speckles + denoiser come out distorted, shadow is also too opaque. What settings may I try out? I feel I am nearing completion of the tutorial but am still having gaps in knowledge on how to render light properly.
2.92.0 blender file: https://pasteall.org/blend/6474d6f8bd5f4b1abbabaa41478e7e6a
Overview layout: 
Lamp:

128 sample before denoise: 
128 sample after denoise: 
1024 sample 1080p 100% render before denoise: 
1024 sample 1080p 100% render after denoise: 
I've been trying different Light paths, but I honestly don't understand the extent of how they interact with each other. I haven't seen any example of what those numbers should be in the tutorial either, if someone knows please let me know. Previously turning off 'Filter Glossy' under caustics improved the shadow but it is now again a little bit too opaque, dunno when that happened. :D
Not too sure what I am missing out so any suggestions would be lovely! Thank you in advance
I just loaded your file and did this: checked both denoising checkmarks

viewport result:

render result:

is this ok for you?