How can i create any software shortcut

Whatever the environment is GNOME,KDE,LXDE how can i easyly create application shortcut.
I am useing lxde now, I INSTALLED snap and flatpak application but auto shortcut didn’t generated .I am able to open those application’s with terminal but the problem is on the background that app and the terminal both running on background if i close that running terminal the application close.

It sounds like a bug in the environment for your session. Snaps generate .desktop entries in /var/lib/snapd/desktop/applications which should listed in xDG_DATA_DIRS environment and pick up by the shell or menu you are using