Silly YouTube seems to have deleted my pinned comment. Here it is again, hopefully YT won't mess with it:ADDITIONS/ERRATA:-The "main DC" is just the "typical...
  1. The DC to aid is the same as the DC for the skill itself, by default. (With flexibility based on the specifics. E.g. if using Deception to Aid a strike, the DC might be the enemy’s perception DC.)
  2. Instead of Crit success/Success/Fail/Crit fail being +2/+1/0/-1, it’s +4/+2/+1/-1

Watch the video to see the logic Ronald uses to arrive at this.