Nextcloud (or rather Owncloud) was one of my first projects I selfhosted (on a Pi). It's also the first software which broke on a upgrade, which isn't strange given my lack of knowledge and it's complexity.

Nowadays I like to split my services, because it's easier to maintain and solves my use cases better. Immich for photos, smb for file access (as I don't need sync), radicale for calendar/contacts. Still, Nextcloud is awesome for getting started with selfhosting or if you need a complete platform with integration and all those bells and whistles.