Sometimes we do forget that the tutorial isn't in this aspect of the game.
So for those that need it, here's some help.
Anything north of the equator of the Left Stick (that is anything on top half) is your Front Foot placement. From the perspective of a right hander, that means that up and right (in a diagonal angle) would be moving your player to the front and right. Up and left (on a diagonal angle), will be front and left.
Same thing goes for back foot, anything south of the equator (bottom half of stick) is your back foot movement. Back and left will move you back and left. I think you'll start to see what I'm getting at now. Basically, the angle and direction of the left stick will move your player in that angle and direction. For pull shots you will need to get on the back foot, otherwise you'll play around the ball, etc.
As for what is being perceived as 'not the shot I played'. On lower difficulties the foot placement is assisted for you. If you want full control, bump it up to Legend (Veteran and Pro have less assistance too), let it be know that you will need to get it very spot on though at that difficulty.
It's recommended to start on Amateur or Rookie and just get used to what the movement and positioning is like.
Also on those difficulties, if you take a look at the ball marker (the circle around the ball) you will see it flash white for a split second. This indicates perfect timing. That will not be there on the higher difficulties though, meaning you need to know your timing to get it in the ideal range.
Hope that helps.
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Oh and I'll also add a couple of other things I forgot.
The colours around the ball indicate where the ball is pitching.
Yellow = Full
Red = Short
Green = Good
The ball marker will also have a gap depending on which line it's pitching, a gap to the left of the ball means it's pitching right, a gap to the right, means it's pitching left. No gap means it's on middle stump.
As for the triggers, they do indeed work. Although it's not really the best showing of them in the nets as they don't do the damage they might on the real grounds.
But yes, L2/LT is an aggressive shot, which means the ball will generally be more lofted. R2/RT is a defensive shot. R2/RT+L2/LT is an aggressive grounded shot meaning the ball will be hit hard along the ground.
L1/LB is your unorthodox shots, like the scoop, sweep, etc. And R1/RB is the advance down the pitch, which is best used against spinners imo.