Consensus and Blockchain - Descriptions of the various types of consensus and how they compare to Avalanche Consensus. Written by Gyuho Lee, who works at Ava Labs. The descriptions are a good start to get the flavor of broad overviews and their differentiations.
Ethereum
Sweeposaurus - Utility to help with moving multiple funds in an Ethereum wallet to another.
Taking Control of Your Digital Identity - Tutorial (specifically aimed at trans folks) for helping an individual manage the information held by various sources across the internet.
MyCrypto Personal Security Checklist - In-depth walkthrough on checking your security and privacy settings with various popularly used services.
Auditing
Crypto Audit Guidelines - JP Aumasson - Guidelines on how auditors and builders should approach “code audits,” written by the author of BLake2 and BLake3
Trail of Bits Publications - All of the public audits and publications from Trail of Bits security firm.
OSInt
Awesome OSInt - Currated list of popular Open Source Intelligence sources
getallurls (gau) - Open Source tool for fetching known URLs from popular databases
Alien Vault - Popular Open Source Threat Intelligence Community