Question on Learning Music Theory(of scales)

[shadowzerg]

Okay, so I'm self taught with no immediate access to a teach(the internet and books have been doing find however..) and I would like to be recommended on an efficient method to learn basic theory when it comes to scales. I can already read sheet music and understand all the ornaments and expression markings(Just to give you guys a base of my understanding if needed). What I'm looking for in particular is learning things like the tonic(Which I know to be the first note...right?), dominant, sub-tonic and other such things in reference to scales. Also, a recommendation on learning music theory(self teaching) in general would be much appreciated as well. Thanks in advance! 

[jlh]

Try this site:

https://www.musictheory.net/lessons

Best,
Josh

[shadowzerg]

Thank you for the link Josh, your help is much appreciated.