FrontendMasters.com has two Vue.js courses, including one by Evan You, the creator:
The second one is less than 4 hours, so I’ll probably watch it.
Here’s another new one:
Here are some introductory videos on vuex (like Redux, but built for Vue):
There’s a series here:
Store:
Getters:
Mutations:
Actions:
Extra info, including how to do “time travel”:
Here are some Udemy courses (often on sale for $10-12 each):
https://www.udemy.com/vuejs-2-the-complete-guide/https://www.udemy.com/vue-js-course/https://www.udemy.com/nuxtjs-vuejs-on-steroids/
Tip: don’t pay more than $10-12 for Udemy courses. If the site tries to charge more than that, ask about free alternatives at a meetup.
There are more Vue courses on Udemy (and elsewhere) but those are the ones I have at the moment. I usually just watch sections of the courses to pick up tips on various features that interest me. 
I read the Vuex documentation today. It has interesting information on plugins and modules.
Here are some more Vue resources:
Non-free – I don’t know much about them, but am just compiling resources here:
Two more Vue links that might interest people:
https://dev.to/vuevixens/how-to-build-a-vue-cli-plugin-3b6b
Podcast:
https://devchat.tv/views-on-vue/