It depends on the player. Here's an example from my save:
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This is a product of my youth academy and, as such, I'm keen on training him up to first-team status. My intention is to turn him in to an
Advanced Forward, although I might drop/incorporate other attributes as my tactics demand.
Advanced Forward is the general direction though. So, on the training page...
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Using the drop-down list in the top right ("Area") I've highlighted all the key attributes for the
Advanced Forward position and displayed my player's progress in each of them. Since he arrived in my Youth Academy I've had him on heavy training, specifically targeting
Dribbling,
Composure and
Pace. This is how much they have increased in that time:
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As you can see, all three attributes started at either 9 or 11 and are now at 14, 14 and 15. After I get
Composure to 15 I will increase
Off the Ball to 16 and then dump the remaining points in to
Crossing (or enough to get it to 14. If I have any left I will put them in
Passing).
In addition to all this, my
General Training is to set
Balanced and
Low. This is so I can put all my players on highly specialised training like this at a heavy intensity. Sometimes players complain about their training (I perform check-ups on every player's progress/regime on the first of each month) but in those cases I have a word with the player and say "you need to step up your training or else lose your place". Only one player ever gave me grief about this but eventually he too began to respond with "you're right".
And that's basically it.