3 Ways to Reset the WordPress Loop (digwp.com)
WordPress does an excellent job of keeping track of what’s happening with the loop, but once you start customizing parameters and setting up multiple loops, it’s a good idea to explicitly reset them using one of three WordPress template tags.
How to Create Additional Image Sizes in WordPress (www.wpbeginner.com)
WordPress has a built-in feature Post Thumbnails aka Featured Images. There is also a built-in function add_image_size() which lets you specify image sizes and give you the option to crop. Using these core functions in your theme can essentially eliminate the need of a third party script like TimThumb in most cases.
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