Accessing the officially-bundled plugins

On your computer (Windows), go to: C:\Program Files (x86)\Steam\steamapps\common\RPG Maker MZ\dlc\BasicResources (Unfortunately, I don't know the MacOS path; if someone tells me, I'll add it here.)

There are three folders: /pictures/, /plugins/, and /system/. Go to /plugins/.

• In here there are two folders: /launch/ and /official/. I'm not sure why they're sorted this way, but either way, both folders have numerous plugins for features like WASD movement, 8-directional movement, overpass tiles, passive skills, and more!
• In /official/ there is a file called PluginCommonBase.js, and some plugins here require it to run. When you add a plugin via the Plugin Manager in-engine, it will tell you at the bottom if it has any dependencies, and how to order the plugins (by dragging them into place on the list) so they load in the correct order.