Connecting vertex on low ploy to high poly

if i am making a low poly to high poly object, do i have to connect every vertex like these? i know a few ngons or tris are okay

what if i were to use mark sharp or edge crease?

Have you tried to connect them together using F key?

haha i am not asking how i connect

Can you please clarify your question then?

i was asking if i need to connect every vertex like a bevel or from a boolean, shown in the picture and if mark sharp or edge crease would work instead if using subd

Hm, sorry, I am not fimilar with it, but I guess you don’t have to do this. At least that’s how I see this.

Every vertex has to be connected to be watertight, but if you want to use subdivision, you’re going to have to use quads instead. If you don’t want subdivision, this is fine.