I just learned Vue.js and it seems he made it harder than it needs to be. Is he using Vue.js version 1? (I didn't recognize some of the paterns he was using fro

I just learned Vue.js and it seems he made it harder than it needs to be. Is he using Vue.js version 1? (I didn't recognize some of the paterns he was using from the documentation..._) Also, from the comments it seems like React has "don't do it this way or you get an error" or "people get caught with this because they didn't know the side effect of xyz..." Vue.js had almost not surprises once I learned how the system worked, maybe I am not deep enough into it yet, and it has similar gotchas as React?