Cornerstone of Chemistry is the Periodic table:
Added 12th June 2020
This is an interesting website. Each element is explained in a video, with history, reactions and interesting information. Great if you are more tuned in to practical demonstrations when learning. Up to date as it includes up to Element 118.
I found this as a template site, and managed to update it, so that it now includes all 118 elements.
Shared on my Overleaf, read only but you should be able to compile and download it as PDF.
By Offnfopt - Own work, Public Domain, https://commons.wikimedia.org/w/index.php?curid=62296883
light edit – RG, as requested, had no problem. Added a larger size image for details view.