Over 0.5 goals simply means for 1 or more goals to be scored during the game. It's a very simple and potentially very easy bet to win.
In sports betting, "1X" is a betting option that refers to a double chance bet. It means you are betting on two possible outcomes of a match rather than just one. Specifically, when you see "1X," it means you are betting that either the home team wins (1) or the match ends in a draw (X).