I contacted the host of my project for a problem I was having with inserting data from a form into a db on their server. One of the answers they gave me was:
...for future reference, never declare a prefix, always leave this option blank.
I understand what a prefix is in English grammar, but what does it mean in php code? I have been teaching myself php with tutorials and none of them have mentioned this term. I hadn't even realized that I had even used a prefix. I was just modifying code that I found in tutorials based on on current needs and on advice from people here.