Although it's a good skill and important, learning the mechanics of photography isn't about conservation of materials. In that regard, with digital can be an asset.

But, the "just fix it in photoshop" approach is not a good way to learn photography either, though it's a fine way to learn photoshop.

Just as with analog, capturing the image correctly at the first step of the process will save a lot of hassle later.
Doing that takes a lot of exposing pixels or film, and looking at the results without resorting to post exposure fixes.