The difficulty I'm having with moving from FG to Foundry for a possible Savage Worlds game is many fold but basically boils down to: You must UNLEARN what you have LEARNED.
When I went to the Reddit r/foundryvtt page (which the FoundryVTT homepage points you to, incase someone is wondering why I went to Reddit) and asked if there was a tutorial on it, I got the responses of "No, there isn't" (which was helpful) and "What are you talking about? It just plain works out of the box. We use it all the time." (which was not. And it didn't help that the person saying this to me was factually wrong in other parts of his reply which degraded my confidence in his answers). So, documentation, tutorials and help is lacking when compared to the incredible community at FG forums and the multitude of FG tutorials on Youtube.
I mean, my issues are not large...
For example: How do you move things from the Gear tab to the Traits Tab > Quick access area? Is that even possible? If not, why is the quick access area there? When I add something to the Quick Access area (such as a weapon), why can't I seem to delete it from there instead of having to go to the Gear tab? I can delete Active Effects from there, though.
When I target a creature and roll the attack, why doesn't it tell me if I hit the target or not? Why doesn't it tell me if I got a raise? Is it able to do this and I just set it up wrong? Or does it just not do so?
When I attack with a weapon, do I have to roll the Attack from the Traits tab then change to the Gear tab to roll the damage? Why isn't Fighting a field in the item on the Gear tab so I don't have to go back and forth? Or is there a way to do both from one tab?
Why can't I see both the Combat Tracker and the Chat at the same time and have to pop back and forth between the two to advance the combat and then see what is happening during the combat? If I can, how do I do that?
... But they are piling up on each other.
TLDR: I wish Foundry had better documentation and tutorials for beginners and people switching VTTs.
Just a quick edit/Note: Some of these things I've learned since posting but I learned them by... uh... watching a tutorial. See how that works. heh.