This post was prompted by recent discussion of problems/cautions concerning UEFI. All my machines boot in Legacy BIOS mode and I have minimal background in UEFI.
A preliminary web search yielded:
http://x86asm.net/articles/introduction-to-uefi/
https://blog.thomasmarcussen.com/tag/configmgr/
https://blog.thomasmarcussen.com/unified-extensible-firmware-interface-uefi/
https://wiki.restarters.net/UEFI_and_GPT
http://x86asm.net/articles/others/index.html
https://www.thomas-krenn.com/en/wiki/GUID_Partition_Table
I have not yet read these in detail. Is there other introductory material that would be recommended.
Also, in https://lists.debian.org/debian-user/2019/05/msg00107.html , it was suggested that a separate thread be begun on the question of
"Whether or not you can update/install UEFI if you are not booted into UEFI." I would like to see that discussed. I hope I've used an acceptably broad subject line: TIA
