Standard procedure is to lay the line spool flat on the floor, label up ... then hold line between finger/thumb with moderate tension & crank the handle ... while watching the line between the spool & whichever guide the line goes through first ... making sure that the line does not start getting more twists/turns in it, than it had when you first started reeling in ... if it does start twisting up, flip the spool over & continue filling the reel. Fill to within a max of 1/8" of the lip of the spool.
Dragging the empty line behind a boat at idle speed or through the grass will help remove twists that occur from casting. Sometimes your jig flies through the air like a knuckle ball, and other times it will spin like a airplane propeller ... imparting a twist in your line for every 360deg roll of the jig.
Also, after the line has sat on the unused reel for awhile, I like to take it outside & tie it off to something immovable and walk off about 2-3 times the distance of a good long cast. Then I stretch the line several times, holding it for a few seconds at max stretch, then cut the line loose from the immovable object and reel the line back on under tension (between finger/thumb). That usually seems to make the line more limp from the stretching, as well as remove any residual twists left over from the last use when dragged through the grass & back onto the reel.
... cp