I've recently started using a Mac after using Windows for 20+ years and one annoying thing is that I have to re-learn all the shortcuts. I've found that you can change small stuff like swapping the Ctrl, Fn and Option buttons, but the shortcuts themselves would still be different from what I am used to. I've also found Karabiner helpful for remapping individual keys, but it won't let me create more complex rules, such as assigning Alt-Tab to change between Windows.
Is there a program/extension/terminal command that would allow me to remap any shortcut in the system to any other shortcut combination?