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Sebastian Lasse

@al1r4d

independent from any language, the checklist is

:digitalcourage: read the specifications in the correct order :)
This means you can read the protocol spec. first to get an overview w3.org/TR/activitypub/
but all of these W3C recommendations have "Normative References" and you need to understand them from the bottom up first, roughly the stack is
1) https (you can use other transport mechanisms but this is common)
2) Linked Data

3) JSON-LD (the underlying Linked Data format)
w3.org/TR/json-ld/
4) The definition of the Vocabulary
w3.org/TR/activitystreams-core
5) The Vocabulary
w3.org/TR/activitystreams-voca
6) The protocol
w3.org/TR/activitypub/

[and apart from it natural language values for multilanguage and rel links and e.g. webfinger for mastodon]

Then you can go on with nedjos checklist
socialhub.activitypub.rocks/t/

PS
my language is JS / deno

www.w3.orgActivityPubThe ActivityPub protocol is a decentralized social networking protocol based upon the [ActivityStreams] 2.0 data format. It provides a client to server API for creating, updating and deleting content, as well as a federated server to server API for delivering notifications and content.