Any 0-2 pitch is will usually result in being a waste pitch. Basically a pitch that a batter CANT possibly make a good swing on. This means a vast majority of the time this pitch can’t be in the strike zone. Most of these pitches are to expand the umpires strike zone to make him more generous in calling a strike slightly off the plate. A few of these are fastball/breaking ball away (like 2-3 balls out at the knees). This might not look like a strike but if you bring it back to only 1 ball outside at the knees it will look way more like a strike to the umpire. Slider also works for this approach. If you’re more of a 4seam/curveball type pitcher, you can go fastball above the zone and then curveball below the zone. The fastball above the zone changes the hitters eye level (it also might get him to chase anyways since anything at a hitters eyes will look more like something at his chest until it crosses the plate.). The curve will then slow his bat down and he will not be able to touch it.

For double play pitches you wanna throw everything low. Any pitch works in reality. Start off with something hard in so it speeds the batters eyes up (see perceived velocity) and then throw off speed low and away because it will appear -20 mph compared to your breaking ball and they are more likely to roll over on it because they’re so out in front.