"You need to get on that stat! You are leaving money on the table. ."- I am referring to company 401k with match. For instance, if my company offers 6% match on the first 6% I put in for the 401k, if I am making 100k, I put in 6k, they will give me 6k to my 401k. So instead of 6k, I have 12k a year for my 401k. Combine that with compound interest over time, you are maxing your earning potential for the 401k.
"The only exception if their offerings suck and have high fees If that's the case, you need to open up your own IRA or Roth IRA. They can have better offerings."-Some companies do not match or have 401k funds that have high fees. In those cases, it's better to get a Roth or Roth IRA. They have better performing and lower cost funds.
Now if you don't know what a 401k or Roth or Roth Ira is, you are going to need to Google that. To summarize, they are usually a collection/index of stocks and or bonds that you invest in for retirement. They have different contribution limits and different rules.