Laws of Kashering?

Where can I find the laws of Kashering Kelim for Pesach? In past I saw it on the site
Thank you

Can I do hagalah on cutlery putting a metal strainer in the pot of boiling water, drop each piece in then remove the strainer with all the cutlery and put it into a pot of cold water? Or does each piece have to be done separately?
Can I kasher both sets of cutlery at the same time?

Yes. No. Yes.

Can an air fryer be koshered for Passover? if so how?

Can you run it on it’s highest heat for several minutes empty?

Yes

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That would work.