I hesitate to write because I am quite new to Fusion myself, and the top of the desk under my keyboard is beginning to look like an impression of my head from all the banging I've done there, but FWIW, here goes.
Fusion is totally **** about constraints, and you'll suffer if you disregard them. Let's say you want to hold the left mouse key down and drag a line somewhere. The line doesn't seem to drag, but everything else moves every which where as you mouse over it It's a chore to start constraining early on, and it was especially so for me when I wasn't really sure the line or curve was what and where I wanted it. That's a Fusion trade off, and you'll have to decide how much effort you want to give it.
To move something, you drag a mouse square over it in the good old-fashioned way, then do a CTRL-C to copy it, and then a CTRL-V to paste it. Here's where things get interesting. Fusion will place the copy exactly on top of the original. You won't know it's there, and, like me, you'll probably think you screwed up or that the command didn't work and, like me, you'll probably try it again a couple of time. Now you will have three or more instances of the object, and you still won't be able to tell. Get to know CTRL-Z really well and back out until you're at your start point again.
If all goes well, you'll see one of Fusion's in-depth move icons appear on the screen when you enter CTRL-V from the keyboard. There's lots of info and options there, but for now you'll just need to find three: the small square near the center, the upward-pointing arrow, and the sideways-pointing arrow. Mouse down on any one, and the copy should move off its origin as the mouse moves. You'll be able to see it. Use the square for an unconstrained move; the up arrow will only allow the copy to move up and down orthogonal, and the other arrow gets you left or right the same way.
I came to Fusion from a program that placed a copy just off-center of the original so I could see it. Then I had the problem of moving it again if I wanted it on the same axes as the original. Fusion does it the other way around. Fusion does a lot of things the other way around. It's maddening at first, but at least it's maddening in a consistent fashion. Don't despair. I've already done enough of that for everyone on this board!
