002 Curve-Finance
https://curve.fi/

003 Principal-Docs
https://smartcontracts.org/docs/base-libraries/Principal.html

003 HashMap-Docs
https://smartcontracts.org/docs/base-libraries/HashMap.html

003 Option-Docs
https://smartcontracts.org/docs/base-libraries/Option.html

005 Shared-Keyword-Docs
https://smartcontracts.org/docs/language-guide/sharing.html#_the_shared_keyword

005 Caller-Id-Docs
https://smartcontracts.org/docs/language-guide/caller-id.html

008 Upgrades-Docs
https://smartcontracts.org/docs/language-guide/upgrades.html

008 Array-Docs
https://smartcontracts.org/docs/base-libraries/Array.html

008 HashMap-Docs
https://smartcontracts.org/docs/base-libraries/HashMap.html

008 Iter-Docs
https://smartcontracts.org/docs/base-libraries/Iter.html

009 Internet-Identity-Explainer-Video
https://www.youtube.com/watch?v=oxEr8UzGeBo