Check out example codes for "don't want to update revision while updating field by code in sitecore c#". It will help you in understanding the concepts better.

Code Example 1

bool silent = true;
bool updateStatistics = false;

using (SecurityDisabler disabler = new SecurityDisabler())
{
    using (new EditContext(item, updateStatistics, silent))
    {
        item["ShortHeadline"] = item["Title"];    
    }
}

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