I am working on a graduation project related to "Aspect extraction (AE)".
I'm pretty confused about POS taging, syntax tree, grammar rules, and other low-level NLP stuff. I need a reference that teaches me these things in detail, so if any of you know I hope you don't mind me?
I know my question is not about programming directly and this may not agree with the site, but I really need to.
This is not an easy one! I assume that you are trying to understand the underlying 'why' and 'what', so, if I were you I would start with the one and only "Speech and Language Processing" by Daniel Jurafsky and James H. Martin. They have a whole section (Section 17 in my Second edition) on the representation of meaning, and state representation, with a whole subsection on Aspect. In addition to that, the book will also help you understand various existing approaches to POS-tagging and the other topics you mentioned above, and, the book is available online for free! There is even the draft of the 3rd edition out there. Additionally, after reading the chapters above, you can check out how other people do aspect extraction here