Got the Gimmes?
When my son was about one year old, my husband trained him to be okay with having toys grabbed away from him, because we knew that it happens a lot in day cares, and we didn’t want him to get upset and yell and hit. My husband turned it into a game of grabbing a soft, little ball from our son, grinning and saying “Mine!” and giving it right back. It worked.
Our son became one of those kids in daycares and preschool that just shrugged and reached for another toy, when another kid took one that he’d been playing with.