Line twist comes in two ways. It comes when you spool up your reel and it comes when you reel against the drag while fighting fish (or snags).
When spooling up your reel keep in mind that not all spools of line are spooled in the same way from the line factory. So while some people will tell you to set the spool on the ground with the label up, when spooling a spinning reel, that does not work for all brands of line!
The way to spool your spinning reel is to set the spool on the ground and take 7 turns of the reel handle. Watch the line coming up off the spool. If the coils get narrow, flip the spool over. Take 7 more turns of the handle. If the coils get narrow again you'll need to flip the spool over about every 6 to 8 turns of the handle as you spool up your reel.
If the coils stay large, leave the spool on that side and spool your whole reel. Viola, no line twist.
The other tip is to avoid reeling against the drag when fighting fish. It makes your line twist and makes you look like a barni too :)