Which option you choose depends on how technical you are 👍
Easiest is just sign up with a third party provider, there's a signup tool here:
https://nextcloud.com/signup/
(Note, this tool signs people up with a pool of third parties, it isn't signing people up on Nextcloud.com itself.)
Harder but slightly more independent is using a managed hosting provider:
https://nextcloud.com/providers/
Hardest but most independent is installing Nextcloud on your own server:
https://nextcloud.com/install/#instructions-server
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