I've been without a group for quite a while, and found other things to occupy my time. When I get back on D20pfsrd, I notice a few spots that mention updated rules. Sneak attack applies to more people, something happened to the assassin class to nix the spell list, et cetera.
Is there a place I can find a comprehensive updates list for rules? Errata as well if I can get one. I need to sort out what's changed so my dm and I can be on the same page. Thank you much!
(I did try to search this through Google, it kept pulling up the Pathfinder update for no man's sky, which is far less interesting or important to me)
These examples you give have been from the start of Pathfinder, you probably went with old 3.x rules (where sneak attack didn't work constructs, undead or plants and assassins had spells). So I don't know what to tell you.
EDIT: Erratas did happen but they affected things like Crane Wing feats, Scarred Witch, Master of Many Styles, Jingasa of Fortunate Soldier and stuff like that. Don't know how long you've been gone. And erratas are downloadable for free on the errata-ed book main page.
Did you play 3.5 or Pathfinder? If PF, what books did you use?
The big thing may be all the books that have come out after your set (if any) was published. New spells, new feats, sometimes new ways to define a character (like traits from Ultimate Campaign) -- and always, new classes. Real cool concepts, in most cases.
Are you thinking of finding a group to play in (in person or on-line)? Playing PFS? Putting together a group and running a game? How much info you have to soak up will differ based on your answer.