As a newbie GM, I wonder what happens when a PC fails on a Skill Check, but nothing stops them from rerolling it.
E.g. In the starter set, after defeating a goblin ambush, the players can spot a trail by succeeding on a DC 10 Wisdom(Survival) check.
If a player fails to notice it, couldn't they reroll the check or let another player try with the excuse that they're keep looking for clues?