How to play multiplayer in 'Minecraft: Java Edition,' using either

There are three ways to play multiplayer in "Minecraft: Java Edition:" through an online server, a LAN server, or a "Minecraft Realms" server.

How to Play Minecraft Multiplayer

How to Play Multiplayer on Minecraft PC {Java & Bedrock Edition}

Unable to play on my friends realm. : r/Minecraft

How to Enable Multiplayer on Minecraft Java

How to Make a Minecraft Server on Raspberry Pi

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How to enable multiplayer on Minecraft Java Edition

Minecraft parental controls guide - Internet Matters

Minecraft: Bedrock Edition Realms Creation FAQ