I have published a book on WordPress called 'Practical WordPress'. It is actually an eBook (PDF, MOBI & ePUB) of tutorials I write on my website. You can even read them there (ibenic.com). The coupon code is product-hunt for 50% off which you can add by appending /c/product-hunt to the URL or by clicking on the second link here.
Here you can learn about using OOP and JavaScript in your WordPress projects.
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