Note: The version in the image may be outdated.
Need help finding your Minecraft mods folder?
Windows: You can press the (⊞ Windows + R) or type run in the bottom search bar to open the dialog and type %appdata%\.minecraft then click OK. After that, open the mods folder. If you do not see the mods folder, create a folder called mods in the .minecraft folder. (Note .minecraft contains the dot)
Mac: You can press the (⌘ Command + Space Bar) or click on 🔍 at the top menu bar to open the dialog and type ~/Library/Application Support/minecraft, then click on the minecraft folder to open. After that, open the mods folder. If you do not see the mods folder, create a folder called mods in the /minecraft folder.
Note: The version in the image may be outdated.