Have a look through Joomla's new features from 3.7's custom fields and admin menu manager, 3.8's new router and through to some of the features announced for Joomla! 4.0 such as the transition to Bootstrap 4.
Have a look through Joomla's new features from 3.7's custom fields and admin menu manager, 3.8's new router and through to some of the features announced for Joomla! 4.0 such as the transition to Bootstrap 4.