I'm very confused with all the new frameworks, precompilers, etc that are out there. I haven't done really active web development for a while.
I've been using http://bootstrap-live-customizer.com/ to customize my bootstrap styling which works great for me so far. Now I want to change something like the border-radius at input fields, which you can't do with the customizer. So I thought I'll just copy my bootstrap.less file that I can download from that customizer, edit the corresponding border radius variable and try a less compiler only to find out nothing gets compiled, or rather it compiles but since bootstrap.less only consists of variables there's nothing that is actually being written in my bootstrap.css, correct?
I think I need a way to compile those variables into an actual file that assigns those variables in bootstrap.less to the bootstrap classes? Unfortunately, it's really confusing for me. There are so many things out there. npm, grunt, composer, whatever. How do you even start to figure out how all of this works or even just figuring out WHAT of those tools you need?
Anyway, to get back to this specific case: I have my bootstrap.less. How do I compile it so I get a working bootstrap.css that's not empty?