There are three ways to play multiplayer in "Minecraft: Java Edition," two of which are free. You can join a public "Minecraft: Java" server, or if you're willing to put in some work, create one of ...

In Minecraft, go to Multiplayer > Add Server, use the local IP and connect. After this, you should be able to access it, although you may need to open a port, such as 25656, on your router.

Step 6: Under this section, scroll down and find "You can join multiplayer games". Set it to Allow. The player will now be able to join any online servers on Java Edition.