The Electronic Frontier Foundation set up a resource page for this:
Their guide:
https://www.eff.org/files/2026/04/09/condensed-age_verificat...
Unfortunately, their most prominent call to action doesn't seem to address the various state-specific and non-US legislation (focusing on KOSA instead). Here it is:
The EFF has long been a skin suit my dude, they're just here to dissipate and confuse opposition.