Any guides to get started on plugin development?

I own a server and want to get into plugin development so I don’t have to keep using outdated 1.13 plugins on a 1.16 server. Where’s the best place to start?

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[atc98092]

At the very top of this sub-group, there's a thread specifically on that topic. It hasn't been updated in quite some time, but I don't think that matters with plug-in development.