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By default:
witness condenser_api network_broadcast_api rc_api account_by_key database_api

It will be great if you can mention that too as many are using non-MIRA and only witness plugin. (rc_api gets activated auto-magically)

I deliberately refrained from adding things such as plugins as they are relatively complicated, the whole tutorial is somewhat aimed at people who don't have enough knowledge when it comes to servers, GitHub and Linux. I believe adding in a specific section for plugins would be confusing.