“Also I’ve started a Friendica manual at https://help.friendica.onl/ but it needs to get content.”

Maybe you may translate some content from this guide: https://friendica-hilfe.gitbook.io/friendica-hilfe ?

Most of the functions should be instance-independent (although loma.ml has activated many add-ons)

The article in the JoinFediverseWiki is very short. It could be expanded a little. I used to have an editor account for the wiki, maybe I’ll find the time to reactivate it.

The Channels in Friendica are similar to the “antennas” / “newspickers” in Misskey / Sharkey. Both are very good ways to receive content sorted by self-defined topics.

If you are looking for a way to *send *to different topics, Friendica’s (connected) “accounts” would be suitable for this, But Hubzilla offers more options for this

“Friendica - the BlueSky integration…”

Friendica offers a connector for Tumblr as well as for Bluesky. Ad hoc I can only find a German-language manual for it: https://friendica-hilfe.gitbook.io/friendica-hilfe/basics/bluesky-tumblr-und-weitere-social-media-dienste