Security-focused collection of UEFI links I personally found useful. awesome-firmware-security is a more general collection and may be more useful to you.

• Awesome UEFI
  • Fundamentals
  • Writeups
  • Dumping
  • Inspection
  • Reversing

• Chipsec - Framework and tooling for doing runtime analysis of a lot more than UEFI.

• Jethro Beekman's Lenovo HDD Password series - Beginner-accessible walkthrough on reversing a UEFI-implemented disk encryption mechanism.
• Copernicus - 2015tweet - MITRE's project for monitoring UEFI on Windows. Closed-source.

• via Chipsec on Windows - asdf link the windows setup here too
• via Chipsec on Linux - chipsec_util.py spi dump rom.bin
• via flashrom on linux

• UEFITool, UEFIExtract, UEFIFind - Cross-plat tooling for inspecting firmware images.

• ida scripts here

• uefi-firmware-parser - Python library, parses firmware images.
• MMTOOL - American Megatrends' proprietary BIOS image modification tool (aptio4).
• UBU - useful for replacing binaries in a UEFI BIOS image, wraps MMTOOL. should be obsoleted by uefitool I think, todo