We already know how Naruto trained to use his element. But how do others train to use fire, water, and earth elemental jutsus? Do they burn a leaf and then burn a waterfall? Do they suck the water in the leaf out and then try and move a waterfall? Was there any explanation for chakra natures that wasn't Naruto's?
There were other episodes that explains better how the different chakras works, specially in the original Naruto. Obviously the training would be very different for others elements.
Here are some references
Naruto chapter 321, pages 4-5
Naruto chapter 315, page 13 Thir dDatabook, page 236
Naruto chapter 315, page 15 Third Databook, page 214 Naruto chapter 375, page 11
Fourth Databook, page 249
Naruto chapter 689, page 5 Naruto chapter 316, page 9
Naruto chapter 207,page 8
Naruto chapter 316, pages 4-7
Naruto: Shippūden episode 55 Naruto chapter 361, page 13
Third Databook, pages 274-275
The way to understand how elements works would be understanding their properties, because it explains a lot about the compatibility and the way for creating new techniques.
Simple examples of training for other elements are creating a wall, cut or broke things, etc. Techniques that you see in one element could be imitate in another, but the difference you'll see it in a battle.