Saving

Hard-Save
 * Pros: No risk of save-scumming or player trapping themselves
 * Cons: Takes control from the player, breaks immersion

Quick-Save
 * Pros: Fast, consistent, gives control to the player
 * Cons: Promotes save-scumming, careless players can lose progress, breaks immersion

Auto-Save
 * Pros: Enhances immersion/quality-of-life feature, no risk of save-scumming
 * Cons: Unclear triggers, takes control from the player
 * Neut: Mistakes that don't trigger a Game Over are permanent

Perma-Death
 * Pros: Greatly enhances immersion
 * Cons: Typically limited to a single play session to offset loss of progress
 * Neut: Mistakes are permanent

Note:
 * These systems can and usually do overlap
 * In a mainstream title, it is kind to let the player know whether the game will auto-save or not before they begin

Obsolete/Retro
 * Passwords
 * Warp Zone