Legacy

Legacy, or Ascension, is a game mechanic added to the game on the 8th of February 2016, though it was in beta for about a year and half before that. The core idea of the mechanic is simple: You can mostly reset the game to get boosts(AKA Ascend). Ascending mainly gets you two things, prestige level, and at an equal rate, heavenly chips. Prestige level provides a straight boost to cps; 1% per one prestige level (provided your Potential is 100%). Heavenly chips can be used to purchase Heavenly Upgrades. Ascending also increases your ascensions by one, provided you get at least one prestige level from it. This number is used for achievements. The total prestige level you would have if you ascended can be expressed as $$floor(\sqrt[3]{n/1,000,000,000,000})$$ where n is your cookies baked all time.

Potential
Potential is the effectiveness of the Prestige Level CpS bonus. The base prestige level potential is 0%, meaning that prestige will not give any effects without any potential boosting upgrades. The potential can be increased up to 100% with 5 upgrades unlocked from Legacy. Other things that affect the potential are Dragon God, which multiplies the potential by 1.05. (Reality bending increases this multiplier by 0.005, making it 1.005 with only reality bending and 1.055 with both), and Lucky Digit, Lucky Number, and Lucky Payout, each multiplying the potential by 1.01.

Cosmetic
Upgrades which don't affect gameplay, but can be useful.

Strategy
Probably just guide links, maybe stuff for some specific HU.