The two health-pool related concepts have been a little trickier to understand for newer players. Luckily d4fuQQ created a very handy visual representation for Fortify and Barrier that will make them both immediately very clear!
Most players probably already understand these concepts, but it’s always good to have a refresher, especially when it’s this well visualized, with all the possible variations included.
Diablo 4: Health Bar explained (Barrier & Fortify visualized)
Hopefully this helped some players, but in any case d4fuQQ did a great job presenting it!