The original Minecraft from minecraft.net — Mac, Windows, or Linux
The server has a whitelist. You can't connect until the admin adds you. Your Minecraft username is the name you chose when you created your account at minecraft.net — it shows in the top-right corner of the Minecraft Launcher, or in-game above your character.
Open the Minecraft Launcher. Make sure Minecraft: Java Edition is selected (not Dungeons or Legends). Click Play.
From the Minecraft main menu, click Multiplayer.
If a warning about online play appears, click Proceed.
At the bottom of the server list, click Add Server.
Server Name: Goat Server (or anything you like)
Server Address: goats.sortoflikethis.com
Leave the port blank — it uses the default (25565).
Click Done.
The server will appear in your list. Double-click it (or select it and click Join Server). If it says "You are not whitelisted," the admin needs to add your username — ask them to run whitelist add YourUsername in the admin panel.