Reference docs are topics that are too high level to be explained in a rust-doc, and too low level to be explained in a high level tutorial. The goal is to minimize this category.

FRAME, Substrate

• When should you write a pallet and when should you write a contract.
• System accounts; consumers and providers.
• Currency related traits, old ones (Currency, ReservableCurrency etc.) and new ones (fungible::*).
• All the ways to log and print in the runtime. The final answer to: https://stackoverflow.com/questions/57109715/how-to-print-out-tracing-message-in-substrate-runtime-development
  • https://polkadot-blockchain-academy.github.io/pba-book/substrate/tips-tricks/page.html#logging-and-prints-in-the-runtime
• Composite enums. Runtime enums and normal ones.
• origin, account abstraction
• lose coupling vs. tight coupling of pallets.
• Weight and benchmarking.
• How to configure block times: Make block time configurable polkadot-sdk#483
• How you create a substrate based extrinsic from scratch using just SCALE @josepot (UncheckedExtrinsic)
• cross chain asset transfer one-stop shop: Document Cross Chain Asset Interactions with Asset Hub polkadot-sdk#107
• outcomes of https://forum.parity.io/t/chatgpt-powered-data-wizardry-to-understand-substrates-biggest-pain-points-using-stackexchange-data/1869
• Defensive programming.
• Chain-Spec: what it is, what it does, how to use it, etc: Rust doc user journey: Chain-spec #20 (comment), and genesis builder @MichalGawronskiKot
• CLI: Rust doc user journey: CLI #17
• All the ways in which you can blow up either stack or heap in runtime. Box, and being memory conscious.
• Signed Extensions
• Offchain workers, and how they are not a magic silver bullet
  • https://forum.polkadot.network/t/offchain-workers-design-assumptions-vulnerabilities/2548

Pretty much every lecture in PBA is a candidate.

Misc

• Substrate Architecture; WASM Meta-protocol; Runtime
• Ultimate testing tools index: https://forum.polkadot.network/t/test-frameworks-and-utilities-for-polkadot-and-friends/2612
• How to navigate rust-docs + answer common questions using them.

### Subtasks
- [ ] https://github.com/paritytech/polkadot-sdk-docs/issues/34
- [ ] https://github.com/paritytech/polkadot-sdk-docs/issues/39