I use muffwiggler for any industry news or sometimes advice on how to approach a certain patch.
I use this site for planning racks.
Lastly VCV Rack to figure out what I need, and in the case that VCV Rack has a digital equivalent to a hardware item, I will play around with it on VCV Rack before I buy it, so as to avoid buying something that I either do not need or don't understand how to use.