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Kaplan foundations is for people who need grammar review before approaching the MGMAT or OG Verbal, particulalry students who did not have grammar in their high school or not confident on their grammar.
Irrespective of you going through kaplan foundations book or not, you would need to go through MGMAT and OG verbal guides.
Some verbal books are good for learning the core concepts. For the examples given in the text, you can skim through and figure out what's right and what's wrong. For many people, spoken english is different from what's "correct" or GMAT-preferred english. So it's important to get this down, especially for the sentence correction section of the exam.
At GMATPill, we've taken a video-based approach to learning these core concepts. But probably, if you're really new and want to start off with "what is a noun?" -- a comprehensive verbal book is a suitable option. Once you get past the foundations, give a shot to the GMAT practice questions. You should see an improvement but if that improvement is not enough and you want to get 100% accuracy, then you might start to consider some other options out there.
The key with a verbal book is that you want to spend the effort to learn everything, but then apply it to other questions. Every time you see another question, it's the same but different. And that thinking that is required to adapt to a new question is critical in seeing improvement. To some degree, you can learn that "adaptation" skill on your own but this will take continuous critical thinking. So just be prepared to study critically and to think critically - that is the key to improvement on the GMAT.