If you have troubles since the update to WordPress 4.5 please read this post before opening a new thread.
How would I go about increasing the size of thumbnails on the home page? What files should I edit?
To edit the thumbnail size you have to open functions.php and just change the value for the files at the top.
Please be aware that these changes won’t get applied to images already uploaded. If you need to change anything within your CSS files depends which images you have changed, ut you can easily spot the classes to edit by checking the source code of of you page once it is rendered within the browser window.
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