Over time, for the rest of your life perhaps, you can practice, and you will still be learning. There will always be the opportunity to be challenged and even baffled. The more you know, the more you can read and interpret.
There is a learned science behind aging scat, tracks, etc... Always more to learn. Outside of life experience, I've not taken a public offered course specific to game though looking into it as I try to narrow my focus on wolves, specifically.
When you cross tracks, scat, twigs, shrubs - what are you looking at? For myself, I'm quickly assessing the setting and the decision to investigate further is based on that quick review. Simple example - shine on elk scat vs greyed scat. Quick assessment. However, tracks in snow are great as it amplifies the track though if the edges are solid glazed... the quick assessment evaluates when last snowfall occurred, temperatures, etc. Direction, speed, so many variables we assess.
A decent short article: http://www.adfg.alaska.gov/index.cfm?adfg=wildlifenews.view_article&articles_id=636
What catches your attention - what are you looking for in tracks, scat, etc?