teffilin minhagim

what are the different minhagim of teffilin.

I know that there are minhagim that are more popular (sefard, ashkenaz, sephardi, yemenite, ari)

but then I heard of more unusual minhagim like karlin.

In addition, what is the minhag of wrapping in, and doing on the finger top bottom, and top and hten around 2 fingers