Awesome

Currently the following parts of the spec are available in annotated form:

Phase 0

• The Beacon Chain
• Beacon Chain Fork Choice

Altair (Light client support, validator reward simplifications)

• Changes to the beacon chain
• Light client sync protocol

Bellatrix (Merge)

• Beacon chain changes
• Fork choice (terminal PoW block verification)

Capella (Withdrawals)

• Beacon chain changes

Sharding

• Changes to the beacon chain