Creating lines and their relationship to axes

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Hello, fellow Fusion 360-ers!
I have a question for everyone:
Fusion 360 noob and new to computer design in general. Also new to asking questions on fora, so please be patient with me! I also searched before posting, and I couldn't fins a similar question or applicable relevant information
I studied engineering nearly twenty years ago, and perhaps a lot has changed since then, so please forgive in advance for the basic nature of this question.
My question is: I would like to create a design with the origin (0, 0) as the center of it, and I would like to create a line that is bisected by the y-axis. Yet, I go to create a line, and I have no idea whether or not it is centered on the axis, nor can I move its midpoint to it. I can get a midpoint to appear by hovering over it while holding shift, but then I can't do anything, and when I attempt to offset it, it won't move. Conceptually, I have a hard time accepting that I can design or draw something with an arbitrary (0, 0), I mean, of course, it is certainly possible, and the object can exist just fine without it.
I can create two parallel, equal lines, but they aren't where I need them to be!
In short, is there a way to assign axis-relative values to the endpoint of a line, e.g. (-25.5, 14.5) (25.5, 14.5)? Also, is it possible simply to reflect a line over an axis? I'm sure that there is something very simple I am missing, and I thank everyone in advance for patience and willingness to assist. I can see the power of the program, and I am excited to become proficient, and a big thank you to Autodesk for allowing us all to benefit as a collective in allowing our creativity to access their platform.
Cheers,
Alden