Let me share the best resources I refer to when learning Org Beamer.
#Emacs #beamer
https://orgmode.org/manual/Beamer-Export.html
https://orgmode.org/worg/org-tutorials/org-beamer/tutorial.html
https://hartwork.org/beamer-theme-matrix/
https://github.com/fniessen/refcard-org-beamer
https://tug.ctan.org/macros/latex/contrib/beamer/doc/beameruserguide.pdf