Download java JRE for Windows
OpenJDK java JRE for x64: https://builds.openlogic.com/downloadJDK/openlogic-openjdk-jre/8u282-b08/openlogic-openjdk-jre-8u282-b08-windows-x64.msi
Or Oracle brand Java JRE for x64: https://www.oracle.com/java/technologies/javase-jre8-downloads.html#license-lightbox (look for the link that says) Windows x64 79.68 MB jre-8u281-windows-x64.exe Note, you have to click a radio button somewhere that says you accept their license.
https://www.minecraft.net/en-us/download/server
Windows x64 1.16.5 server.jar download https://launcher.mojang.com/v1/objects/1b557e7b033b583cd9f66746b7a9ab1ec1673ced/server.jar
Then in a command prompt run: Go to the folder where you have server.jar Make sure java is in your path
java -Xmx1024M -Xms1024M -jar minecraft_server.1.16.5.jar nogui
Now it should show up as a server in the Minecraft Multiplayer server list. If not, add a server and type in the ip address for the local server, such as 192.168.1.123
The default spawn area now has spawn protection in the server.properties set to 16. If you want those blocks to be editable, change it to 0 in server.properties and restart the server.
https://minecraft.gamepedia.com/Tutorials/Setting_up_a_server
(referencing old version minecraft 1.7)
https://www.howtogeek.com/202958/how-to-run-a-simple-local-minecraft-server-with-and-without-mods/
Server with Mods! - Spigot MC
When one server isn't enough - BungeeCord + Spigot MC
https://www.spigotmc.org/wiki/bungeecord/
Peter's Mod list and Minecraft links
https://gist.github.com/peteristhegreat/a6497e80455429abe67d7be323cec7c8