"The IBM Z Xplore Learning Platform (formerly called Master the Mainframe) is a fun way to get hands-on experience across a variety of technologies, to develop

"The IBM Z Xplore Learning Platform (formerly called Master the Mainframe) is a fun way to get hands-on experience across a variety of technologies, to develop valuable skills, and to earn digital badges – with no prior knowledge required!" I've had this bookmarked for years, never gotten around to starting it, though. Web development continues to entertain, challenge, and sustain me.