[QUESTION] Toolbox for newbie

After several years distro hopping from Manjaro, Garuda, Linux Mint, Ubuntu, EndeavourOS, Fedora Workstation & OpenSUSE, I got tired & want to settle into something like immutable OS then i interested to try Fedora Kinoite with KDE as DE.
Now i have some questions about toolbox (sorry if i asked silly question, but I'm still newbie) :

• Now i already setup my container & install some packages in it but the shortcut is missing from application launcher (a.k.a start menu), how i can link the shortcut from package inside toolbox to host application launcher ?
• If i made a file (ex text file) from inside container will it show in Home directory ?
• If something crashed inside container will it also crashed my host system ?
• Why some packages doesn't work inside container like Wine, Lutris, or Bottles ? Does it's need special dependencies to make it work ?
• Can packages that modifying system (ex green tunnel, vmware, or QEMU, & hblock ) work fine ?