First lightly read through the chapters, highlighting or underlining the key concepts in each chapter that seem the most important. Then at the end of each chapter apply the simple Feynman technique:
1) Choose the concept you wish to understand (or wish to check whether you understand) and write down the name of the concept.
2) Then try to explain the idea to yourself as if you were teaching it to someone who didn’t understand it at all. This will help you develop a deeper understanding of what you already understand but also will help you pinpoint exactly the things you don’t understand.
3) Once you identify the gaps in your knowledge, go back to the reference material and reread or relearn the material until you can explain it in your own words.
And that’s it! This way you will gain a solid understanding of the material, and pick up the concepts rather quickly in a simple and straightforward way.