I was having trouble figuring out how to spawn particles at the location of a player/entity, because the command only accepts coordinates. I'm sure it's not too complex, but I'm still kind of noobish with this stuff. Thanks!
You'll need to use /execute to cause the targets to run /particle at their location.
More Minecraft-things: https://sourceblock.net
Guides for command-related features (eventually moving to Source Block): https://github.com/skylinerw/guides
I primarily hang out in the /r/MinecraftCommands discord, where there's a lot of people that help with commands: https://discord.gg/QAFXFtZ
Their corresponding subreddit: https://www.reddit.com/r/MinecraftCommands/
Ah, okay. Thank you!