Redoing bathroom floor tile and tile baseboard.

I've been told that when laying the floor tile, I must leave a small
expansion gap between the tile and wall. Can anyone confirm?:

Also, should the tile baseboard along the wall rest on the floor tile or
should there be a small gap between the two? If there is a gap, won't the
grout get forced into it and then eliminate the small expansion gap that I
created when laying the floor?

Thanks for the help, folks.