> ## Documentation Index
> Fetch the complete documentation index at: https://course.pokesignal.io/llms.txt
> Use this file to discover all available pages before exploring further.

# Appendix C · Sources and Method

> Where the course came from, how the material was checked, and where its limits are.

This course is an editorial synthesis, not a transcript digest. It turns a large body of
practical discussion into a coherent way to think about a Pokemon card business, so the chapters
teach the resulting decisions and tools directly. This page explains the research boundary that
supports that approach.

## The source set

The first edition used 296 YouTube videos published from January 1 through July 1, 2026. One
additional video was discovered, but its download failed, so it could not be transcribed and was
excluded. Videos published after the cutoff are not represented. The source set came from three
channels that approached the business from different combinations of selling, sourcing,
collecting, content, and store operations:

* [Poke Pastor TCG](https://www.youtube.com/channel/UCu2WgZgrG76fn8AL25Z-SLQ) — 155 videos
* [DJsPokeCenter](https://www.youtube.com/channel/UCcqOwhcCo4nI6g8jftTlxzQ) — 94 videos
* [PokeNE\_Pokemon](https://www.youtube.com/channel/UCmsaaIoiGBvvt22HELiqlfA) — 47 videos

The source material is predominantly US-based and frequently discusses dollar-denominated
transactions and US marketplaces. That is why the course is labeled **US-v1**. The underlying
business questions often transfer to other markets, but the fees, taxes, shipping choices,
platforms, and legal obligations may not.

## How the material became a course

Each available video had a machine transcript. An excerpt entered the research notes only when
its text matched the recorded video and timestamp. Records pointing to the wrong location were
corrected, and two excerpts with no match were left out.

Editors then compared related ideas across the source set, kept important disagreements and
conditions, and assigned material to the chapter where it could help a reader make a decision.
Private notes behind each page record support, scope, calculations, cautions, and any current
source the wording needs.

## What verification does and does not mean

Transcript matching can show that wording appears in the machine transcript. Confirming exact
spoken wording would require listening to the audio. Neither check proves that a reported sale,
profitability, workload, or business result was independently audited. Self-reported outcomes were
therefore treated as cases and context, not automatic benchmarks for the reader.

The same distinction applies to repeated advice. Agreement across several videos can make a
business idea worth examining, but repetition is not statistical proof. The final wording had
to survive a separate editorial question: under what conditions is this useful, and what would
make it wrong?

Claims about changing or high-stakes subjects—such as taxes, credit, fees, platform rules, and
shipping policies—were checked against a current authoritative source when retained. When a
general answer would depend on the reader's jurisdiction, account, or circumstances, the
course teaches what to verify instead of pretending one rule fits everyone.

## Limits to keep in mind

* The channels were selected for practical business material, not as a representative sample
  of every Pokemon seller, store, collector, country, or business model.
* YouTube favors stories that are timely, visible, and worth turning into content. Quietly
  stable businesses and failed experiments may be underrepresented.
* Several videos may discuss the same market event or repeat the same experience. Those are
  overlapping observations, not independent data points.
* Prices, products, platform features, carrier services, and regulations change. A dated
  example explains a decision at that time; it is not a current quote or policy guarantee.
* The synthesis, emphasis, calculations, and any remaining errors belong to this course. The
  channel links are acknowledgements, not a claim that the creators reviewed or endorsed it.

To hear the creators' work in their own words, visit the channels above.

***

*This course is free to read and to share as-is, with credit. It may not be sold or
republished in modified form. License: [CC BY-NC-ND 4.0](https://creativecommons.org/licenses/by-nc-nd/4.0/).*