凌空长老 please come in.

You said below. I am new learner, please clarify. Thanks!

Q1. What is FDRXX and $110B (required miminum?)?

Q2. Can you recommend a few MMF and companies?

The interest rates on the MMFs offered by banks are usually lower than those offered by mutual fund companies. For example, the current yield of the $110B Fidelity Cash Reserve Fund ( a MMF) is 4.74%. If you plan to park the money in the MMF for a long time, I suggest you put your money in FDRXX, then set up a ACH link to your checking account. This way you can get high yield and easy acccess to your money at the same time.