Which is Better Responsive Design qualifiers "Smallest Screen Width, Size or Density"?

Question

so for me as new android developer,

i need to know, how professional developer make a responsive app for all diferent Screen Size and Density...

i have try many implementation, how to make a responsive layout,

starting from create diferent size on my drawable (l,m,h,x,xx,xxx - hdpi) with "Constraint Layout" using "sdp & ssp" and combine with some layout qualifiers like "Density (l,m,h,x,xx,xxx - hdpi), Smallest Screen Width (sw480, sw600, sw720), size ( s,m,l,xl )...,"

so at the end, i know, no one can make 100% same view for every dierent screen size and density.

but, from some qualifiers on my question tittle between of "Density (l,m,h,x,xx,xxx - hdpi), Smallest Screen Width (sw480, sw600, sw720) and Size ( s,m,l,xl ),"

Which one is better to implementing when i try to make responsive design?

so here, i really hope you can sharing and i get the answer from your the best experience.

thanks for your time and your experience to answer my question.