B/X is good. When characters have d6 hp and it’s instant death at 0 the combat becomes way more serious and tense.

If you’re going to die, better to die on the main quest. I avoid side quest distractions.

The best lore is lore made at the table with the players. The rest is just gm inspiration.

Removed by mod

If you’re running a sandbox, you just need to review a bit ahead of the party in the various dungeons.