There are two issues that people bring to mind with solid table tops; warping/bowing/cupping, and seasonal movement.
From what I understand, from my research so far, the table top should be allowed movement. My question though is how to properly connect this to allow for the movement but still keep a sturdy surface. The articles I read were complicated.
I'm also wondering how to keep the top flat. My table top will probably be about 3'x4' and about 3/4" thick, with solid oak boards. I know the basics like keeping the boards 4" wide or less, and alternating grain patterns, but I don't know if this alone prevents movement.