If you mean Java Edition then Curse is the best place to look right now. Of course you have to have Forge installed first for mods to work. And mods are version specific (although most 1.12 mods will work on 1.12.2).
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How to Install Minecraft Mods Using Minecraft Forge. Minecraft Forge allows you to install mods into your Minecraft game. With a little set-up and a quick download, you can be on your way to playing with mods in no time.
Don't assume you can mix 1.7.10 mods and 1.12.2 mods. Forge: If you mean Bedrock addons (Win10 Edition is part of bedrock) then try If you're running a Java Edition server and want bukkit/spigot plugins instead.I don't know where the best place to look for those is but I know Curse has some of them.