The last two days, I have 2 users that just came form nowhere. I deleted both right away. Thank goodness I was on my computer.

What is a good security plugin? Is there anything else I need to know about Security other than strong passwords? Thank you

Under Settings->General, the Membership box should be un-checked.

Hope this helps and that you don’t have a more serious problem!

I use Wordfence on all my sites for security.