The Starting Block of Music Theory
Easy learning

The Starting Block of Music Theory
This book is great for you if you already play an instrument and want to learn basic music and notation. There are many possibilities, with just a little study time music becomes easier to understand and more interesting. It is also a lot more fun when you know a little more. 
So what are you waiting for? Just start reading and remember to use your instrument if there is something in the book you would like to try and play. It is always an advantage if you keep your instrument close at hand.
Useful tips for learning music theory from this book
Remember to take one step at a time and to read music theory for 10 to 15 minutes a day. That is plenty to start with. It is a bit like learning an instrument, if you practice a little each day then you will see results over time. The same applies to music theory. If something seems difficult then stop for a while, spend a little extra time on it or go back over some things, take your time. Once in a while you can jump over something and move on further, then when you go back at a later stage things will become clearer for you.