You can install mods in "Minecraft" by playing the "Java Edition" and using the third-party app Minecraft Forge.

As a free and open-source application for Java edition, there are hardly any reasons not to use Minecraft Forge - many mods even require this mod loader to operate.

Java Edition users of Minecraft will need Java installed. After doing that, you’ll need to download the version of Minecraft Forge that matches your server version.