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# Building Modules
This repository contains documentation on concepts developers need to know in order to build modules for Cosmos SDK applications.
1. [Introduction to Cosmos SDK Modules](./intro.md)
2. [`AppModule` Interface and Module Manager](./module-manager.md)
3. [Messages and Queries](./messages-and-queries.md)
4. [`Msg` services - Processing Messages](./msg-services.md)
5. [Query Services - Processing Queries](./query-services.md)
6. [BeginBlocker and EndBlocker](./beginblock-endblock.md)
7. [`Keeper`s](./keeper.md)
8. [Invariants](./invariants.md)
9. [Genesis](./genesis.md)
10. [Module Interfaces](./module-interfaces.md)
11. [Standard Module Structure](./structure.md)
12. [Errors](./errors.md)
13. [In-Place Store Migrations](./upgrade.md)
