Seattle University baseball player Jack Reisinger slid way to early into first. He face-planted hard, but eventually got up and dusted himself off. On the plus it didn't cost him anything but a little ego.
SU won the game, 4-3. Jack made the highlight reel rounds. No doubt he'll think twice about sliding into first base.
There's rarely a need for a player charging down the first base line to slide into the bag. Runners can run over the base, and sliding can slow them down and expose them to injury.
However, there are certain situations where it may be advantageous, such as when a bad throw pulls the first baseman off the base. To keep things safe and avoid reckless play, baseball has some rules about sliding into first. Just remember, never stop short.