Advice on opening up Gportal server

So ive had this server for awhile, only me and my family played. unfortunately only I play now and Ive been debating opening it up.

I was thinking a world were all play styles are welcome. But any way

I want to keep it password protected, so I guess I give password to new players, Im worried about toxic players, cheaters and griefers If they need to be removed, then I guess I change password correct?

Also I noticed in Gportal a banned section (obvious) but what does whitelist mean and what is it used for.

I havnt figured out exactly what I want to do yet but any advice would be greatly appreciated.