Anybody knows how IWBootstrap4 works. they look promising but I couldn't find anything online say how to use them, any idea?
For example I know how to integrate bootstrap with intraweb using templates but how to utilize those stuff? I thought it might be the same way, but it didn't work, so is there another approach to use them?
I tried to use them directly -> new form -> add them but nothing works.
any idea how to start?

I have successfully used BS4 components. Just add bootstrap js and css to ServerController.HTMLHeaders or to form ExtraHeader: something like
and
Drop a component on form and in its css property you can use bs styles (e.g.: d-flex flex-column ms-2 me-2). Or, in style property, you can enter css properties (e.g. width: 300px background-color: green).