5e Basic house rules
Chapter 1: Abilities
Advantage/Disadvantage has three levels: +/-2, +/-5, automatic '20'/'1' (and +/-5).
Chapter 2: Races
Dwarves: Lose Dwarven Combat Training, Tool Proficiency, and Stonecunning. -1 DEX. Mountain dwarf adds 1 level of armor training and +1 to STR.
Elves...