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you need a J-1 visa. In order to get the J-1 visa you need a sponsor and a job offer.

for the skills it depends what you're looking for.

Thanks for the answer!

A sponsor, financially speaking? Or can I pay for the expenses, and only ask for the job offer?

You can pay for the expenses but you still need a sponsor. It's kind of weird. You have to pass an interview with the sponsor and then they review your case and give you the files you need to get for the visa at the US embassy.

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