I've had a similar experience. After struggling with react and ember for a while, I ended up switching to using Vue, which IMHO, has a much simpler setup with Vue loader.

I'd like to know this too. I experimented with Pythons nltk library, but it's definitely a different world out there than simple programming.

Go ahead and start using Bootstrap 4, I've been using it in production and it's quite useful.

I'm also using Bootstrap 4a5 without issues on a small site that I initially upgraded from Bootstrap 3 mostly out of curiosity, and then pushed live when I didn't discover any major issues.

Since it's a "major rewrite of almost the entire project"[1], I can't recommend that new Bootstrap users invest any time in Bootstrap 3.

[1] https://v4-alpha.getbootstrap.com/migration/