For A Realm Recrafted we focus on having an experience with as little as possible commands you'd have to remember. Nevertheless we could not completly achieve a command free server. Below you'll find a list of every command and a brief description of what it does.
/trigger chat_coordinates - posts your current coordinates into the chat
/trigger durability_ping - toggles a ping warning for breaking armor & tools on/off
/trigger equip_hat - equips the item you're currently holding as a hat if you don't already have one equipped
/trigger goat_horn_tpa - toggles the goat horn tpa features on/off for you
/trigger horse_stats - toggles the info display for tamed horses on/off
/trigger rtp - randomly teleports you to a spot in a 10000 block radius around spawn in the Overworld/Outer Wilds
/trigger sit - sit anywhere!
/trigger tp_heritage_harbor - teleports you to the Heritage Harbor location
/trigger villager_data - shows relevant villager data for the nearest villager within 12 block radius
/trigger reset_progress - resets your heritage and progress (only useable once per month)
As for the claiming commands. You can view an up to date list of all commands on the github wiki of the mod author. Flan Wiki