What is a good OPS and SLG?

Could you please explain what a good OPS and SLG mean in the context of baseball statistics? Are they indicators of a player's performance, and if so, how do they factor into a team's overall success? What are the benchmarks for a strong OPS and SLG, and how do these metrics compare to other statistical measures like batting average and RBI? I'm interested in understanding how these numbers can help me evaluate players and make informed decisions when following or betting on baseball games.