As others have said, only word documents may give you annoyances.
I'd suggest trying it in a virtual machine first. See if you can do what you want to do. Switch to different distros if you need to. If/when you're convinced, make a proper installation.
Depends on what you expect them to do exactly. Today's transistors aren't much different than older ones, just smaller mainly. People of, say, 20-30 years ago may have the technology to inspect them (electron microscope or something like that), and the knowledge to understand them, but not the equipment to reproduce them.
If you go much farther back in time, say before integrated circuits (1960) or even transistors (1947) were invented, I think it's unlikely that someone could reverse engineer the thing
Remember the part where Krillin and Piccollo make 2 copies of themselves to fight Nappa? They edited that moment to look like they make Naruto's technique
You could have advertising without creepy tracking surveillance. Contextual ads, based only on the content of the current page and nothing else. Still relevant, still makes money
Pen and paper first