I'm off to a great start learning FreeCAD today. I installed it on my iMac, then I spent over two hours trying to figure out why it wouldn't launch. MacOS had put the annoying "This is an application downloaded from the Internet; are you sure?" dialog on the second monitor where I wasn't looking.
Inkscape and The GIMP also prefer to put dialogs on my second monitor. I don't know why.
Anyway, I intend to model a brick today. Wish me better luck!