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To modify product collection before rendering category page follow these steps:

1. Override Magento\Catalog\Block\Product\ListProduct

2. In function _getProductCollection after if statement insert your code:

   $collection = $this->_productCollection; foreach ($collection as $k => $product){ // Here goes your code to modify product // For example:

   $collection->removeItemByKey($k);// Remove original item from collection } $collection->setOrder('position','ASC');// Reorder collection as you want return $collection;