Good evening!

If you watch curling games (irl) it helps a lot.

1.: you cant get the stone to go straight, as they dont do it in real life, because in that case the line of the stone whould be unpredictable (the ice’s surface is not perfect, and every error whould make the stone turn a little)

2. In this game you only have two options: sweap or not sweap (if you sweap the stone will goes faster and more staight (a very little)). Unfortinately you cant sweap only  on the left or right, but in real life that also pays an important role.

3. In normal set the stone will always curl inside, if you want to make it curl to the other direction, yust press the button on the left side (two yellow arrows on it)