Earlier quoted context omitted.
Bootstrap is so antiquated. It is also far from easy, and even if you learn a lot about bootstrap is will not make your project suddenly look good. Not to mention the container system is one of the most confusing things I have ever seen, but maybe that is just me.
What would you recommend in its place? I’ve been using bootstrap for any web side projects of mine mostly for its ability to flex and handle multiple devices sizes and also because its defaults look passable out of the box. I agree containers are confusing but honestly making a custom web app look good on all resolutions/aspect ratios is complicated in my opinion.
That said, the Bootstrap 4 defaults are much more modern looking than Bootstrap 3's.