You can install Minecraft Forge for free from the Forge website, and then use it to download and enable mods.

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

There are quite a few mods available in Minecraft, and they are usually restricted to the Java Edition. While behavior pack add-ons can change the way Bedrock Edition runs, mods can do so much more.