do I need a vpn with sequoia

Virtually all internet connections these days are already secure. If you're unsure, click on the URL/search field of the site you're currently on. If the site URL starts with https, then it's already encrypted. In which case, a VPN will do nothing useful.

No, unless you're part of a business or school which says otherwise.

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No. Only use a VPN if directed to do so by your workplace to create a secure point-to-point tunnel to their network.