A couple of points from the Nov edition of MacWorld may be of interest. One was about reduced support for 32-bit apps, this being the last OS to support them. The other was something to do not being able to find or download older installers from within Mojave - so if you think there may be a need to go back to High Sierra or Sierra you may want to ensure that you have saved a copy of the installers before you upgrade to Mojave.