Dont't have any idea what *.sublime-project and *.sublime-workspace are doing? Forget where the project files are? Project Manager helps in organizing the project files by putting all files under Packages/Users/Projects/. It is inspired by Atom's Project Manager.
You can install Project Manager via Package Control. To launch the Project Manager, you can either open it under the Project menu, via the command palette, or use the hotkey ctrl+cmd+p (ctrl+alt+p for windows/linux).
Drag some folders into your Sublime Text window and add a project to Project Manager. The options are self-explained, enjoy!
You can additionally add the following keybind in your user keybind settings file for "Open project in new window"
{
"keys": ["super+ctrl+o"],
"command": "project_manager_list", "args": {"action": "new"}
}
Just put your .sublime-project and .sublime-workspace files under the directory Packages/Users/Projects/.