But always notice you can't build multiple .debs with checkinstall & checkinstall force you install binary against your will like make install.
Libreoffice, gtk3.0, qt5.10+ is the example you can't build single deb it won't work it'll cripple whole applications.
If you start to become proper package maintainer or want to have repo like Steve did. You need debbuild, debmake or dpkg-buildpackage.
After build it'll lay egg .debian.tar.xz, .orig.tar.xz .dsc that can use for autobuild debian packages on obs repo.
This tool kinda handy suitable for steal abilities for other debian based distro & reverse binary build.bester69 wrote: dpkg-repack
https://packages.debian.org/stretch/dpkg-repack
Like ChaletOS layout changer for example. I did it once the result went hilariously worked.
There're some distro that have their own utility but didn't release source on github, gitlab which pissed me off.
But thx to this now I know how to absorb ability from other distros as I wanted.