Fortunately online calorie counters have really simplified the process! I didn't start out with a book or anything, I just signed up on a free website. Essentially you search, like you would with google, for a food and items popped up. Choose the one that best matches what you just ate, input the measurement (cups/oz) and click "enter". The counter adds it to your log. Keep doing that throughout the day and you'll get your total. Not unlike entering entries into a checkbook or accounting ledger.
There are a lot of other issues around it, how many calories one should be intaking, etc. Perhaps this is information you can get from a comprehensive book, but there are tons of online, free how-tos for calorie counting. It's a fairly easy process. Good luck!
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