What keywords is my site ranking for

This is a much possible question. I think article title is more and this is a heart of website. Many people will not research enough about the website relevancy and he/she choose any irrelevant article topic this is very poor thinking because Search engines not only indexed your content. Search engines only follow your website relevancy. If your website is something like Food relevant and your article title is how to buy a car so this is unnatural pattern of optimization. As a professional SEO expert I have facing thousand's of similar people who can make website irrelevant and ask me why our website is penalized by search engines.

Basically Content topic is higher value for search results and increase relevant to your industry traffic generation. If you don't familiar with keyword research so that’s ok this is not a big issue. There are so many people facing this challenge. If you need guidance so there are some rules of keyword research following this strategy and find out the keywords on demand.

Firstly make your website domain relevant on your category for example if your idea is food and recipes so build your website domain title something like spicyfood dot com. (If you target any region so add targeted location). 

Secondly move on title relevancy. Title is a important part of website. Make sure your title relevancy is 100 percent. If you don't do that so you will not achieve any king of rankings or traffic.

Thirdly add Meta keywords and meta description relevant to your website title. Add more than Meta keywords but text description written 100 percent original and relevant. 

Finally start keyword research. I will suggest you using Google Adword keyword research tool. Because this is user friendly option and you can see more accurate monthly search results. I will also suggest you low competition but highly relevant to your industry keyword suggestions. Word of keyword title does not meaning but relevancy of article topic and keyword topic is important. If you can add relevant keyword on your website so you can see improvement before a month.

I will suggest you SEOcompetition analysis before starting keyword research.