Have a look at the following examples:

*keep it simple and avoid the use of jargons.(incorrect)

Keep it simple and avoid the use of jargon.(correct)

* Remember your international visitors by avoiding regional word usage or technical jargons that could alienate.(incorrect)

Remember your international visitors by avoiding regional word usage or technical jargon that could alienate.(correct)

Why?

The word "jargon" is an uncountable noun or mass noun which refers to words and expressions used in a particular profession or by a particular group of people, which are difficult for other people to understand.

Being an uncountable noun or mass noun,it can't take 's' in its plural form.Therefore,it is wrong to say or write 'jargons' as the plural form of 'jargon'

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Isn't jargon an English word?