How to change entity before it is created or updated.

Example How to change entity before it is created or updated using hook_entity_presave().

First example

function MODULE_entity_presave(EntityInterface $entity)
{
    if ($entity->getEntityTypeId() == 'node') {
        if ($entity->getType() == 'article') {
            $entity->set('title', $title);
        }
    }
}

Second example:

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