So I've read most of what I thought would be the related documentation on the site and pretty thoroughly scanned over majority of the rest especially the node references (which by the way, only shows me a white box with a black border about 20x20 px at the top and the parameters which only say the same thing the do in the software - don't know if that's something to look into. Shows this for all node reference pages.)

With what I'm doing, I can connect any arbitrary lines at their start and end points (though I'm sure there is a much better or best practice vs what I'm doing) - however, currently, I'm stuck trying to connect from the end or start point of a line to the end or start point of an arc. I first just tried adding some ports. But I'm assuming I need to do something like a mapping to create a link between the end parameter in degrees to coordinates right? I've attached a rough diagram I made in paint but also a finished example of what I am aiming to accomplish. Ideally to make my design process less tedious. (Mainly to create precise designs the are rotated, translated correctly, etc and connected at the shared points using the pattern in the title.

By the way, thanks, I can't believe I had yet to find this program for a decade or more - it's the missing piece. What I've not gotten out of any other program. Probably tried close to a hundred; yes even stuff from Github.