If I create a link with UTM parameters that have utm_campaign, utm_medium and utm_source does it matter what order I put them in? I found a site that helped create them that recommended campaign then medium then source but another site created a link with source then medium then campaign.
As long as you have only one query parameter of each name (one utm_medium, one utm_source, etc.) the order makes no difference.
When you have duplicate query params (a bad idea unless you know exactly why you're doing it) then a given parser might take the first one only, the last one only, or all of them combined into a list/array. There's no actual standard for which one "wins" (in fact there isn't even a general standard that requires query strings to be considered name-value pairs at all, except for form posts... but that's another matter).
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