To further answer your question, after a couple of great responses, OPS+ then takes that number, normalizes it against the league with the average being 100, and accounts for things like park factors as well. Basically both are solid metrics for how good a player is.
For example, your current OPS+ leaders are:
-Baby Vlad (210...meaning he's a 110% better than a league average hitter
)
-Tatis Jr.
-Matt Olson
-Jesse Winker
-Nick Castellanos
-Max Muncy
-Kris Bryant
-Acuna Jr.
If you go to just for OPS, you get a reasonably similar list, with a few changes in rankings.