The challenge of unawareness for impartial altruist action guidance

The core posts of this sequence are the posts numbered 1-4 in the titles, which introduce the problem of unawareness and its significant implications for cause prioritization.

"Winning isn't enough" (first-authored by Jesse Clifton) and "Should you go with your best guess?" are background. The essential content from those posts is summarized in the core sequence, but I strongly recommend reading the background posts in full beforehand.